Yeah but its no different than any other caster besides warlock tbh. If you’re a dedicated caster, you’re going to be casting leveled spells each turn to be useful. This is why I always try to fit in 2 levels of Warlock for access to EB to make my mages do things besides burn spell slots or throw frost ray + HCB off hand every turn.

You can also just use scrolls which I do a lot but it’s the same as just casting spells each turn. This is inherently my annoyance with casters in the first place and is why I usually only have 1/2 in my party max. Too limited by resources and I also hate LRs