Yes, on higher lvls they can be strong enough even as might wizards, I know few ones... In CG it can be useful if you are holy magic wizard (so almost might wizard), especially in 2x2 battles, in 1x1 against certain factions it can make you quite weak. It all depends on your opponents.
https://www.lordswm.com/pl_warlog.php?id=4572187
This player used to play TG as might wizard while he was active, maybe he was not so succesful but I liked this way more to watch than magic one :)