I have some stuff to say on this topic, actually.
One of the things they removed was the ability to handle arms/legs/joints via what were essentially more backbones. You could have the backbones be split off, all different directions, and the Debug Squid from a very early alpha is thought to have given Spore it's logo. Sad that such a thing is impossible to currently recreate.
While I understand the Gameplay choice, it's still a scientific failure, and I think that a lot of the "removed" content should have stayed.
It's fun as a game, but it could have been funner, and don't use it for your Biology essay.