Speaking as a DM myself, I personally steer clear of those kinds of starts and try to give my players some sort of primary thread to follow until they go their own way. Everyone meeting in a bar is kind of cliche frankly, and there are better ways to hook players. Then there's the fact that this is a video game, not a tabletop game. Starting in a bar wrks better around a table because you're with your friends, with new characters and you've all set aside a few hours to play around and have fun together. A video game has to hook you earlier on so that they make sure they've convinced you to continue devoting time to that particular game and not any of the others you could pick from. I convinced a friend of mine who is familiar with cRPGs and TTRPGS to play the first Pillars of Eternity, a game I absolutely adore, and they told me that the beginning was too aimless and didn't give them a clear, coherent goal to be going towards and that killed his sense of investment. And having gone back and played the game again, I can agree that vague beginning was definitely the weakest part of the game.
Also maybe I missed something, but BG3 doesn't seem to be a save the world story, just a save yourself story. You're not chosen ones, you've just been caught up in a bad situation that you need to get yourself out of.
