Click-use is a real thing! Developers try to limit when possible.
That's not Larian priority. Their design require on average more steps than necessary - confirmation for self cast spells, entire hotbar management, chain system that is less efficient click wise than traditional system. As it was pointed before, there are offensive powerful multiple target spells that are implented correctly, when trading one needs to switch to barter manally as default screen lacks functionality, inventory management requires sending to stash or tagging items as wares one by one by using drop down menu, when looting there is no efficient way to split loot between party members like in other RPGs.
Streamlining, or efficient UI is simply not the thing in BG3. If Larian wants to remove clicks, they have plenty of ways to do so, before having to give spells targeting system not fitting their mechanics.
If Larian sees certain spells as too powerful, they are free to modify them - they take great liberties with the source material already. Making spells fiddly to target just doesn't have a positive impact on gameplay. Those spells haven't been nerfed, they just take more time to cast.
