Hey, your VNDB list is... Quite something.
Anyway, I think I have a different problem, because as I'm getting old(er) and becoming more of certified failure at life, reading coming-of-age high school stories becomes kind of taxing. The heroines themselves though, they only rarely feel like actual highschoolers. For example, if I remember well, the main cast of Flowers are all high school freshmen, so 15-years-olds. However, they neither look nor act the part. The notion of age is all so abstract in both VNs and much of anime that I'll probably have to get much older to start feeling that dissonance.
On the other hand, I don't really get off to otaku media in the first place, so the "cute little animal" kind of appeal shouldn't spoil my enjoyment. I'll skip the h-scenes either way and the romance should still be satisfying enough.