Multiplayer is nothing but a boon. Those games may be great, but they would be better with friends.
No matter how good solasta is or how faithful it may be 5e dnd, it will never be able to deliver what Bg3 can, because it is and always will be a single player experience.
BG3 will never be able to deliver what BG1 and BG2 did... Is that because they were solo games ? Or is it just a personnal opinion ?