I just don't like actual magic being pigeonholed that hard, you know?
Having a bias is fine, but having an entire school of magic that's propped up to be peer to all the others, but it only does one or two things, is boring (It lets you command some animals and transform into others alongside the universal magic bomb stuff, that's basically it.) Ghyran does healing, but it also does water, floramancy, and soil manipulation stuff. Aqshy--the fucking El-Single Minded Magic itself, creates fire yeah, but it also controls emotions, and eases things along so that runaway reactions are more likely to happen (Fire burns hotter, emotions run hotter, that kind of thing.).
Amber Magic exclusively does "Turn into apex predator--not even universal shapeshifting, just specifically into a wolf or a bear or an eagle--and the very best ones alive can also turn into a kind of dragon." and "Control a small subset of animals, not even all of them, just some." And all of the Arcane Marks exist to make your life miserable unless you're a hobo out in the woods (And even then, only a bare handful of them actually help instead of just not hurt you if you're the only one you ever have to deal with)
For all fourth edition seems to do a lot to making the Colleges a lot less straitjacketed, there wasn't really any of that attention put to the Amber College.