Why are there trade limitations?

It's for diversity in a pack and between characters. It's not a lot of fun having two characters with the same trade, or having six Hunters in a pack which makes your trade feel less important, etc.

We don't use hovers because many users are on our site mobilely and hovers don't work so well there, but I think @Dante has the most to say about that since she coded it!

I'm not opposed to this, I do think it would end up messy and hard to keep track of in the end, though. Personally I wouldn't pursue every single trade or every specialty even if I had the opportunity! It's just too much for me. On a personal level I also just don't like the idea of a character being able to master or even pursue everything, just because it is impossible to be good at everything, but that is only my opinion.