Sorry, I am fairly new to this genre having played BAldurs Gate years ago but nothing since.
From a post by Fellgnome below can anyone tell me what CD stands for?
"And just to add even more to the downsides, we have CDs and AP costs being reduced by your dmg stat (str/dex/int) which means a hybrid is getting less effective skills for more total skills that they can use less often. After a certain point, you simply need stronger skills and lower CDs more than you need more skills. "