HOWEVER, in BG3 there are effectively no rest restrictions, so casters don't have to worry as much about preserving slots throughout the Adventuring Day. This mitigates the "slot cost" of casting an additional BA spell each turn, making it more of a pure buff.
In BG3 you can also use healing potions as a BA (which I think is great). Being able to cast a BA healing spell in BG3 is similar to how potions work in BG3 in that you can still cast a spell with an action and either buy more potions or rest after a fight if you want. To me being able to choose to cast a BA spell gives my caster more class flavor and fun spells to do on my turn.
I also love being able to misty step and still cast a spell with an action! To me these are great changes that make the game much more fun to play.
