So if you respec everybody you don’t have in your party as a transmuter wizard, you can just give everybody a bunch of stones?
I mean if you wanted but out of all the schools I didn't find any of the others useful for gale.
Evocation was wasted as I play a sorcerer, allies not taking damage from fireballs is a nice trick, but unnecessary as you just use fireballs / lightning bolt from range and use twinned spells / scorching ray in close combat.
I like enchantment spells in other games, but they are crap in BG3, also the specializations don't raise spell DC so at that point only transmutation for the stones and double potions was appealing.
also spell DCs are quite sucky in BG3, theres a lot of +1 DC gear but all that goes on my main and not on Gale, so all he's really usefull for is casting buffs. Wyll isjust my animal speaking mule and sometimes for tougher fights I swap him in instead of astarion, who also happens to be my speak with undead mule because I gave him the necromancy book to get some big approval points.
In general with playing a caster as MC, I can't find a better companion setup than Shadowheart, Lae'zel and Astarion anyway so others rarely get used other than occasionally swapping in wyll, gale and karlach when doing good conversation options to get approval on all 3.
Oh and Karlach as wild barb recharges some of my spell slots, but I can go back to camp to use them.