If the game releases with multiclassing being broken, and snagging 1 level of wizard gets you all their spells, then that would be a huge disappointment. I am really looking forward to multiclassing, but I just wouldn't do it if it was that busted. My characters wouldn't have any flavor if they were multiclassed. "Oh look, another multiclassed caster with every spell in the game, just like my previous playthrough."
I'd feel like I was forced to stay single class just to keep things fun. I'm sure that would make tactician difficulty really rough if multiclassing ends up being overpowered.
Hoping for the best, but definitely worried with the little info we have.
