"should fighting games remove motion inputs" has always been the wrong way of looking at things. Should there be different input styles? of course! diversity for the genre is a good thing... and there HAVE been games without motion inputs for a long time.

But you look at a game like SSBM (an insanely popular, well-selling game that's still played today*), and it turns out that that game is way hard to play at any competent level for reasons that have nothing at all to do with inputting a quarter-circle.

Even if the special moves are easy to perform, there are going to be techniques that are difficult. Even basic things like "dash into up-tilt" (you have to turn around and make sure you don't get dash attack or up-smash, both of which will get you whiff punished) or "shorthop into back air" (you jump a little and hit back + A. or back-C. but actually hitting a moving player with it is another thing entirely! and whoops, you accidentally did a full jump so silly) are barriers from controlling your character the way you want. Meanwhile more traditional fighting games like DNF Duel or Pocket Rumble get passed up by exactly the audience that says they want simpler-to-input fight games.

Ultimately, I don't think the ease of use alone will make for a lively game that "casual audiences" will get more invested in (and if they get more invested, they're not casual anymore, right?).

That said, I think games like DNF, MBTL, and SF6 are extremely fun to play with Baby Beginner** players. The rules are more clear, they can use more of the tools immediately, and it's easier to see how they can have fun the next time.

This part is the most critical, to me. It doesn't matter if they're hardcore or casual - the moment a player decides to give up on your game forever is the moment they stop growing and their part of the game stops growing. 'Coz fight games are living things. They only live while we play them; simply acknowledging their existence without getting your hands dirty and playing the game does nothing for the game itself.

Personally, I want every game to thrive. That's why I play everyone's game. If I want other people to indulge me and help keep my games alive, then I need to pitch in and help bring their game to life, even if it's just a little bit. Are you playing your game in the corner of your locals and no one wants to challenge you? I'll fight you. Hit me up any time.

I'll accept any challenge, especially the ones I'd lose. All is for the sake of the culture!

*: nintendo may have deleted SSBM from the culture so sorry if no one's playing melee tomorrow **: a player who has just gotten their hands on the game or who has never put any serious effort in. maybe they "just want to mash buttons" or maybe they're picking up a game seriously for the first time ever and have just started their journey. at any rate, an important part of the community. not to be mocked.