The only thing Go-Buster does do that is akin to the 90s is the lackluster development for Yellow and Blue.
I have to disagree with you on these. Development in Go-Busters just wasn't in your face. Yoko pretty clearly grew throughout the show, opening up and relaxing a lot more, losing the weight of the burdens as much as she had in the beginning, whereas Ryuuji's growth was similar - he loosened up from his seemingly forced role as "the oldest one" more (this was especially obvious when Jin was around) and was able to think more about his own interests and desires (and these aspects actually did have token focus episodes I believe).
That's really the problem I have in general with the criticism about Go-Busters' lack of development - it was all there, there just weren't really many blatant episodes devoted to it like in most Sentai. Hiromu's already developed quite a bit only a quarter in, and it just keeps going as the show goes on. Even characters like J show some growth, in weird ways anyway, towards the end, and we even have the bridge crew getting fleshed out to extents not even many critically acclaimed robot anime offer their own bridge crews.
Much as people say "oh, it's just like these shows," but comparing it to the shows immediately after and the ones before it, it almost looks as though it's from a different franchise - certainly experimental. They cared more about the action sequences, they put more emphasis on worldbuilding and logic than even some Kamen Rider shows, their implementation of the Megazords, while not necessarily unique, was above and beyond compared to what most other recent shows offer, and the writing pretty clearly had a lot of thought put into it that we haven't seen since then, and that I can't say I feel I've seen from a prior show either. It was more "Kamen Rider" than that year's Kamen Rider at times.
Considering when Go-Busters aired, and what it aired after, I think a lot of the decisions made for it make a lot of sense. It's a shame they've seemingly done nothing but backpedal when its "failure" may really have just been more due to not offering any toy comparable of ranger keys.