4 is bad more is merrier!
Please give 6 Characters like in the old BG1 and BG2 games.
More people more fun less work to be done to balance the 4 now force ´t upon us voiced companions to crater to every hubris and idea some one has.
I guess you already started to brake DnD rules by giving mages the abilities to learn healing spells because if some one goes ranger the party lacks maybe a rogue or cleric as a mage is the way to go for damage and the high int rolls.
More characters make for a more balanced and well rounded party. Less characters make it harder on the dev and players. Braking the DnD rull´s in wrong places will kill the game. 6 characters is by far less of a evile then giving mages healing spells.

Please let us create a full party of player created characters like in BG1 and BG2 for old times sake.