Vestigial and Analogous Structures

So, I had an idea, which could make gameplay pretty interesting, and a bit scientifically accurate. So, adding a constraint (even a minor one at that) to removing structures suddenly, instead of modifying or simply shrinking them. This forcing players to think about how they can adapt current structures to suit a different niche, such as with homologous and analogous structures, or simply making them stunted and less noticable, as with vestigial ones. Such as with forelimbs on large bipedal predators like many theropods, or hind limbs on snakes and whales. Maybe your creatures lifestyle is more suited to terrestrial life, after you opted for wings. So, instead of removing them, you find a new use for them, such as display, thermoregulation, or even developing them into some sort of weapon. I feel even if this feature isn't enforced, or is simply an option, it would be interesting to see it enabled on NPC flora and fauna.

Please feel free to expand on to or critique this idea :3