I just thought of something. Isn't Namine's body like half Riku now? That Replica body was originally housed by Dark Riku, so like if Riku and Namine ever hooked up wouldn't it be like Riku dating half himself now? Re:Connect Kingdom Hearts!
Don't think it works that way.
Just because KH3 didn't address it, doesn't mean that Roxas didn't feel a certain way about Riku. He openly declared his hatred to DiZ for speaking in riddles, you don't think he would genuinely hate the person that stopped him from being free and fulfilling Xion's last wish? Namine should be there or not... I don't see a major issue with Riku being there.
I don't think it's fair to lash out about the stations needing to be "reworked", let alone calling Nomura lazy. Sora's used the same station since KH1, should that have been "reworked" to include the Final Fantasy characters, Mickey, Namine, Roxas, Xion, Ven... like how many people do you really think should be on the station? Riku and Roxas' own had the necessary characters respectively. Their own would be way more jarring if Ansem/Mickey were missing (for Riku) and Xion/Axel were missing (for Roxas) over Sora missing.
Doesn't mean that he does feel a certain way either. You're grabbing at air here. There's nothing indicating any hatred for him like Diz in the game. And it's apparent that the series doesn't care for direct physical interaction in terms of past issues because Roxas was fine and friendly having a race with him without basis. Real hatred there. And if it was really about hate, then Diz should be there over Riku too.
Roxas got sucked into a vortex that's RAX. His other connections didn't matter and they didn't bother to address them (meaning we lost reunion scenes with HPO, Naminé, and Riku), so there's no argument here if it's not in canon. Just because you
think that a character may hate another doesn't mean it's
fact. Until proven. So yes, Riku has no reason to be in Roxas' heart station. Switch that with Naminé. Or Sora. Or both. I'm assuming you're fine with Xion's too if you're taking this stance.
Now. Sora's hasn't been changed because there is
no reason for his to be changed, you can't be serious. He has all the
right people in it that makes sense.
All of his best and closest friends, not people he "hates".
That's all he needs on his station. And you know why? It's because his station is original and Nomura actually put thought in it instead of grabbing merch from a stained glass collection (that he probably didn't even do) just based on a game's front cover or theme. Ventus too, who has the Wayfinders representing his closest friends. Notice how they are both asleep/ with eyes closed (since it is the Station of Awakening).
Everyone's else's stations need to be updated or reworked. I couldn't believe my eyes when I was seeing merch stations as official stations. Like...come on.