Alright, so one thing you'll learn about me, is that I actually have what doctors call a "severely impaired" memory, which means that I'm actually in the bottom .1% of the population, routinely forgetting things that I've just done. Can't do much to help that.
But yes, I would be all for giving this system a try. That doesn't mean I think I'll like it, though.
The problem with your suggested solution for making mages useful is that it revolves around things that can no longer be done, unlike in the first game. Field control is nigh useless between the prevalence of Phoenix Dive, the added range on archers, and the fact that Battle Stomp exists, and easily cleanses surfaces. Dropping mad combos in the first game was a matter of simply having enough AP to do so; in this game, you have enough AP to cast 2 of what I would consider reasonably costed 1 memory CC or damage spells per turn, and if you say you think a high level air spell will do potentially rip off their armor and CC them, let me remind you that memory costs, AP costs and cooldowns are all going to increase with spell level. So a spell that does this would probably cost 4+ AP, and would be too powerful to be multiple target. So theoretically, this very powerful air spell could rip of their armor and stun them... could. Or a warrior could dive them, rage, and use [insert overpowered replacement for the nerfed crippling blow here]. I don't have to get lucky to kill something in one turn with a knight, and so far, I've yet to see anything otherwise in any divinity game that I've played. Specifically, when you say things like
In this EA they simply made warriors too powerful to make up for the difference in past games.
it confuses me, and runs counter to my own 500 combined hours of experience in DOS and EE.
In DOS, warriors were known for one shotting the last boss.
In EE, they were known for outdamaging Mages to the point that the latter was overshadowed and rendered nigh useless by comparison. Where are you getting the impression that this has ever not been the case? What causes you to think that this will change in the second game, despite the current appearance that the trend is meant to continue?