could you explain to me why you think bucktommy forever would be narratively satisfying but there's no possibility of them introducing a love interest for eddie that would be satisfying? i don't understand

I DON'T think bucktommy would be narratively satisfying.

I DO think there is more potential in the current narrative structure for them to make bucktommy endgame work in a reasonably narratively satisfying way (IF Eddie's story wasn't a factor, which it is).

I also don't necessarily think it would be impossible for them to bring in someone for Eddie if I'm imagining they have all the time in the world to make that work. But the reality of the current narrative is that I don't think they have all the time in the world. And as talented as these writers are, I don't see any way they could introduce someone entirely new, with no connection to the current narrative, and make me buy that person as Eddie's endgame. There just isn't time. A couple of years ago, I would have said that I thought Eddie could have an interesting and satisfying ending to his story if he learned that he didn't need romantic fulfillment to be happy. Since then, however, they've really doubled down on Eddie's loneliness and desire for a romantic partner AND they went for the queer Buck storyline. When you add to that all of Eddie's history with Buck and the way he's welcomed Buck into his life and embraced him as a partner both in his own life and in Christopher's, I don't see any way for them to disentangle that story and introduce someone else (unless it was Tommy, maybe, but nobody's going to want to hear that).

It would just take SO much work and time that I'm not sure they have because it would take several seasons, I think, for it to really reach any level of satisfying.

The difference with bucktommy is simply that it would take very slightly less work (though still a TON of work) for a few reasons.

First, Buck is just Buck. With Eddie, there's also the Christopher of it all to contend with, which adds a complicating layer that extends the work that needs to be done in Eddie's story in a way that doesn't exist for Buck's story (as important as Christopher is for Buck, it's very different from what would need to happen for Eddie who is literally Christopher's parent). So Buck's story has fewer complications to contend with, especially since they've already gotten it off the ground with Buck's queer awakening and introducing his relationship with Tommy already at this point in canon. So there would literally just be less time involved.

Beyond that, Tommy is already an established character in universe. They don't need to do quite as much work to help us get to know him, because we already do, even if only peripherally. But he is established as significant to the stories of other characters beyond Buck. He had a role to play in Chimney's, Hen's, and Bobby's (and hell, even Eddie's!) stories long before he ever became significant to Buck's. So, developing his place among the team and their extended family is not nearly as complicated as it would be with someone entirely new—and even someone from Eddie's past wouldn't have the history with the team, so still, more complications there.

So, yes, I think bucktommy has more potential in the current narrative structure (if—and ONLY if—completely divorced from Eddie's storyline, which it can never be).

But not only do I not actually think either could be a satisfying ending for either Buck or Eddie in the current narrative, there actually isn't anything to suggest that the show is doing the work it needs to to make that potential a reality, either. Because they are not separating out Eddie and Buck (frankly, they're entwining them further). And they aren't even doing any work to flesh out Tommy’s character. I know fandom has grown really attached to him, but the reality is that the character is currently just being used as a pawn to move Buck's story forward. Tommy has a past with the 118 that creates a lot of potential, but that potential is not being used. The character is, frankly, pretty flat at the current moment. They haven't even tried to bring him back into the 118 fold—the only people he's really interacted with since his reintroduction are Eddie and Buck, when there has been plenty of opportunity to fold him back into the team in ways that would at least have him vaguely interacting with the others (like, I don't know, Chimney actually inviting him to the wedding or Hen even acknowledging him at the bachelor party). Their relationship is cute and sweet, but there's nothing that indicates it's any deeper than any of the other relationships Buck has had thus far, and they are actively juxtaposing the bucktommy relationship with the buddie relationship in a way that makes very clear just how surface level that relationship really is when compared to the depth of Buck and Eddie's relationship with one another.

So, no, I don't think bucktommy are going to be endgame, nor do I have any interest in them being endgame. But I recognize that there is currently—literally, in the canon narrative—more potential for bucktommy to work if the show really wanted to make it happen and put in the work, mostly because of Tommy’s history with the rest of the 118.

On Eddie's end, there is no current canon potential. There's no current love interest they could turn around (especially because Edy is a shit human being and people would riot if they actually made Marisol Eddie's endgame). There's no past love interest they could bring back that wouldn't somehow have to be worked into the rest of the team. There's the additional complication of the Christopher of it all and how much that changes where Eddie's story can go and how quickly it can be developed.

It's quite literally just the difference in time. If Buck's relationship with Eddie wasn't a factor, I think they could do it in two seasons for bucktommy. For Eddie and this currently non-existent love interest, I think it'd take a good three or more, and even then, I think it would have to be someone they introduce as a part of the team (Lucy? Ravi? Tommy?) because anyone separate wouldn't have any room to develop sufficiently.

But the reality is that, frankly, the ONLY narratively satisfying ending for Eddie and Buck is one another. Any other option would require dismantling so much beautiful storytelling that I cannot see how it would ever be worth it.