<snip> If 1 or 2 characters have to spend their actions to cast faery fire or something I guess a lot of players would have the feeling not to have enough meaningfull things to do during their turns ... And this is something I understand.<snip>
I don't really understand this line of thinking. Sure, Faerie Fire doesn't do damage, but it can give your allies advantage on up to 4 enemies for
the entire rest of the fight. It's a tactically interesting decision and definitely more impactful than dealing damage once.
If I wanted to play a hack and slash, I'd play Diablo or any looter-shooter. What I enjoy about D&D is the tactics and using your different party members for different roles: the tank draws aggro and can prevent enemies from moving past them, wizard/druid supports with Area Control spells, Cleric buffs the party, fighter/rogue/barbarian deals damage, bard debuffs the enemies. Obviously a lot of turns will be spent dealing direct damage (
cough cough fireball), but turns spent debuffing enemies can also be incredible rewarding.
Of course, in the current version of BG3 there's a lot of mitigating factors. Faerie Fire is almost completely useless due to the ease of getting advantage, Concentration spells are in the same boat because of the prevalence of auto-damage-dealing surfaces (via arrows&flasks), and combats are so slow (want to fight 20+ goblins, spending 70% of your time waiting?). The last two problems will theoretically be fixed by release which should encourage more use of buffing/debuffing/concentration spells...I hope.