^This is because Suisei and Aqua are both very attractive, therefore I assert that Towa is simply enacting a perfectly rational and understandable course of action.
Same but around the time it first aired, I tried looking up Bocchi fan art on pixiv, and almost all of them are Bocchi x Kita for some reason. Back then, I already knew something was up.
Kita's crush on Ryo always felt like a sort of superficial infatuation to me (kind of like Chinatsu's infatuation with Yui in Yuru Yuri). Her relationship with Bocchi, on the other hand, feels more personal and genuine.
Yeah her crush on Ryo is based on who being cool and handsome rather than a broke, idiot, moocher who is a lovable character because she's just the worst.