lol what? Spellcasters are the weakest classes in EA, how are people making these statements unchallenged?
Do people really believe fighter and dual wield martial playstyles are currently weaker than spellcasting?
And what's so varied about spellcasting? Warlocks spam eldritch blast and nothing else, and Wizards spam magic missiles when not using hex+ray of flame because of general poor spellcaster hit rates. Druid just spams Moonbeam. Cleric spams inflict wounds in between maintaining bless.
Just because you play spellcasters this way doesn't mean everyone does. I have experimented with different spells; some I don't use anymore, because for now it is too cheesy (cloud fog & pass without trace), some I limit (flame sphere to only when the enemy has a clear view of the party), but in general I prefer disabling spells and aoes. E. g. last fight against the hag Gale managed to keep her down with grease, last fight against the patrol as soon as their hp was brought down into the range, Gale and Astarion started knocking them out with sleep. On other playthroughs I've used different spell & ability combinations. Otherwise, battles get too repetitive for me.