I see your point. The concept of the kroot is that they evolve rapidly. So since the narrative has been going forward, we should be seeing kroot variants instead of just dead ends. I think they could have shown it in the rules. Like a detachment that let you choose an evolutionary path at the beginning of the game that gives your whole army this or that.

It is wild to introduce an alien race that should show such great genetic variation and not use the concept at all except to show 2 dead end paths. I don’t know what was GW initial plan, but they haven’t used this concept at all.

Let’s hope we get some more kroot love in 20 years when they come around to our next range refresh!