I was ok with the wizard, just don’t make it Gandalf for nostalgia, stick to the blue wizards as that’s actually canon and interesting and expansive to the lore.
I’m pretty sure the rings of power writers thought they could easily get away with combining the blue wizards with Gandalf, but I think it’s just too confusing for regular fans and too wrong for nerds.
A new wizard though, one mentioned by Gandalf in films? That can work!