While only MyUnit and the mages might have the only significant res growth it is still there. I mean let's say Frey has a 15% growth in res(I'm making up this number) that is most certainly better than him have a 0% growth in his default class. I find this to be much better.
Thanks guys for keeping us informed! I don't have the methods to play this but I'm enjoying every bit of info I am reading about it.