I did find it quite weird that the most powerful stage for Digimon was often just a man. Always felt like the, uh, cartoonist(?) had a bit of a superiority complex. Like, what's more powerful than an iron t-rex? An iron man, of course.

Although, thinking now, there was something about them merging with their humans. Was that just what that last stage is? Then I guess, I would allow it as some dramatic thingamabob.

I guess, you didn't claim otherwise, but just to point out that there's actually also a genetic change in cultures that have consumed dairy for longer:
https://en.wikipedia.org/wiki/Lactose_intolerance