It's so interesting how people reacted so drastically to the criticism against the Prequels, disliking both Anakin and the Jedi while liking Obi-Wan, that Anakin and Obi-Wan managed to be basically merged into almost the exact same character.

Anakin has the "relatability factor" of being the protagonist who goes on a journey and has the flaws that are explored within the story. But he's COMPLETELY unlikable as a character, especially in AOTC (and I hear people find child actors grating in general which is a personal taste problem but caused people to dislike Anakin in TPM too). He's whiny, rude, disrespectful, awkward, unforgivably uncool, and comes with a HEFTY dose of secondhand embarrassment in nearly every scene he's in.

Obi-Wan has the "cool factor" of being the one who is the Adult most of the time who is there to showcase how far the teenaged protagonist has to go still, so he gets all of the clever quippy lines and the better fight scenes (and his actor was a little older and more seasoned which probably helped a bit). But he's not the protagonist and so his flaws are not on display and it's not his story being told at all.

TL;DR Obi-Wan is an actually likable character with redeeming entertaining traits, but Anakin had all of the character story beats and protagonist bias.

And this meant Obi-Wan got out of the Prequel Trilogy a lot easier than the rest of the characters, especially Anakin (and the other Jedi).

So then we got The Clone Wars. And TCW is a show that is much lauded for being the show that "saved" the Prequels, generally by "saving" Anakin as a character. How did they do that?

They took away all of those pesky uncomfortable qualities of Anakin's and instead just gave him all of Obi-Wan's more fun likable qualities. TCW Anakin is turned into a dudebro action hero, with tons of cool action scenes to show off just how badass he is, endless amounts of quippy dialogue so he can equal Obi-Wan in their scenes together, capable of flirting with a Queen SO WELL that she doesn't even realize he's faking it until he pulls out a lightsaber. Gone is that secondhand embarrassment, gone are the whiny moments, gone is the inability to have a cool fight scene to save his life. The awkwardness stays just enough to make him ENDEARING, but not enough to cringe at so much you want to turn off what you're watching or just fast forward to the next scene.

And this is the version of Anakin that feels more "right" to people, more true to what they anticipated in a baby Darth Vader. He's angry a lot, violent, prone to lashing out if things don't go his way, but he's also just charming and suave enough that it's mostly understandable why people around him are willing to write off his worse behavior as a momentary struggle. Gone are the tears, gone is the fear of loss being his most obvious motivator. Because THIS is how people expected a villain like Darth Vader to act in his youth.

And then you get fanon Obi-Wan. Because people hated the Jedi, rejected the warrior monks who destroyed their visions of gallant medieval knights, and created a whole new interpretation positioning the Jedi as the villains of the story in order to try to make their peace with that dissonance. But they liked Obi-Wan, and Obi-Wan CAN'T be the villain.

So how do you save him from that fate? You make him more like Anakin. He gets to keep the cool fighting abilities and the fun quippy dialogue of course, but he's now completely repressed to the point that he never told Anakin he loved him until Anakin was burning in pieces on Mustafar. Now he's someone who can barely keep himself together and regularly forgets to eat and sleep like a normal person and has to be taken care of by other people. Now he's constantly being portrayed as just as attached to Anakin as Anakin is to him, just as co-dependent as Anakin is in that relationship, just as inclined towards anger and willing to walk away from the more stuffy traditional Jedi Order so he can have the more natural, healthier domestic lifestyle he's always truly wanted and never known he could have. TCW even decided to help out here by giving Obi-Wan a love interest who is for all intents and purposes just a knock-off of Padme, his own forbidden star-crossed love story. He takes on ALL of Anakin's flaws that make Anakin so "relatable" as a character, keeps his more charming likable traits, and loses all of those things that make him a Jedi, that make him Obi-Wan Kenobi.

So now Obi-Wan and Anakin are both cool, charming, suave, silver tongued, attached, repressed, struggling against the Jedi Code. They're effectively the same person, but one of them just happens to commit genocide and the other one... doesn't. What made each of them distinct and interesting characters in their own right is washed away in order to merge them both into two copies of the One Perfect Character and who you like better at that point is probably just down to who you found more attractive or something equally banal.

And through fandom osmosis, this is what is considered their true/"canon" interpretation, regardless of how inaccurate it actually is.