It's just something I've resigned myself to at this point tbh, as frustrating as it is. It's like how DC and Marvel portray their characters widely differently across their mediums, with only the vaguest of traits keeping them consistent with each other. The longer a series goes on for, the more people start writing and interpreting these characters. At some point, you just gotta roll with it lol. In fact, Sonic's own comics are a great example of this, because there's a whole wealth of differences in how the characters have been portrayed long before Ian Flynn came on board, and even now we have Evan Stanley to compare him too in terms of character writing. That said, I may not like how Tails is portrayed nowadays, but there's at least a core there; he's the smart one; him and Sonic are a Brain and brawn dynamic. Its simple, but it works. Same thing with Shadow really; sure he had his whole big story arc of self-discovery, but that's not conducive to an ongoing brand identity, so it's just easier to portray him as a grumpy rival towards Sonic. Its not about telling a story with these characters, but put them into an iconic role that can be used for any medium. Sonic's the idiot hero, Tails is the smart sidekick, Eggman the bumbling Villain, or Shadow the grumpy rival. Easy roles to work with and gives writers plenty of leeway as long as they stick to that foundation. Characters like Knuckles are kind of screwed though because their foundation (guarding the ME) isn't relevant to the current direction of the series, so they're just left with no direction. Like, he USED to be Sonic's rival, but characters like Shadow and Metal Sonic serve those functions better nowadays. Which makes me curious on how the movie will portray him, and how that's going to affect the character going forward. Depending on what happens, it could define Knuckles' character for a while.