Many reviews complain, that season 2 is really close to season 1. Because there is not a timeskip you should not expect that Minato will change so soon. He is still childish, overthinking, overreacting, anxious, frightened, timid and overly shy. Yes, for western cultures this is annoying, but you should see the context and that japanse culture is different. At least I think in the finale he realizes that he can't be all that anymore and has to make a step forward.

To have the "side couple" play a more active role is also a positive for me and and at least here the adult steps out of his confort zone and he's trying.

So for me, this was really a very good BL and I hope they will continue with another season where we would see a more grown up "Minato-san" and how his life changes with Shin.