Like how do I stat a battle mage? Why are you asking? No one can say oh you pick these stats as your majors, because that no longer applies! What you do it put on armor, slap a sword in one hand, and cast magic. Adjust perks accordingly as you see fit to perfect it in your imagine.
Assassin/theif? I dunno try being sneaky? If it fails try to find out why? Getting too close cuz you aren't sneaky enough? You should find out hey I can cast spells for longer distance, or better use a bow? Spells aren't silent yet? Use magic until you unlock a perk to make spells silent to all but caster. Not a bow guy? well then just practice sneaking... If none of that works for you? Well clearly you aren't thiefy then pick something new. Oh but you don't want to make a new character? Well guess what! you don't have too. You can change your character on the fly. Just start doing other things. They build as you do them! You are no longer locked into certain classes. For once in a video your character can REALLY learn and GROW as you see fit. It's never locked down.
JUST BE WHO YOU WANT TO BE! This game deserves to go down in history as being a MAJOR BREAKTHROUGH IN GAMING. It throws ideas that I've been waiting for, for literal years to become true.
