They were especially obnoxious in this game but I don't think it's just KH3. When I really think about it I never felt like Sora especially liked Goofy and Donald, like he wouldn't actually hangout with them unless weird adventures kept shoving them into his life. Hyuck and Quack might help keep his spirits high like during CoM but he'd still rather hangout with others. People always bring up that Sora didn't think about Kairi during DDD but he didn't think about Donald and Goofy either, the two that he just had several adventures with. We have spent a majority of the series with this trinity. KH1, CoM, KH2, Recoded(it kind of counts), and now KH3 all spend like 90% of the story with them. So you'd think they'd be super close friends at this point but I'm just not feeling it. If anything I feel bad for Sora because he's stuck with them as his shadow when he'd rather spend time with his keyblade wielding pals and Namine.