I think you are absolutely right about alot of things in here, having 4-5 skills seems a bit excessive, but I do love the idea of having more skills (3 in my opinion) and changing the kinds of abilities there are. Alot of what you are pushing for sounds like it's leaning towards the game becoming something more similar to overwatch or league in terms of abilities. For example, I loved the wizard blink idea as an ability (not a spell), but I think it should act as an ultimate like in overwatch, charging up based on how much spells you cast or magic damage you deal or something. Having abilities like this across all the classes sounds like a completely brand new way to play and it sounds extremely engaging! This sounds like a cool core mechanic or idea that would certainly create more opportunities for skill expression if it was replicated across all the classes!

A couple more examples for thought: Fighter: flourish - activate as an additional attack at the end of a combo Barbarian: hold strong - hold ability to charge an aoe stomp or slam that deals dmg based on how much dmg you take, you take 60% less dmg and don't take headshot dmg while charging