I was leaning towards that as well. Leads to more detailed and fleshed out experiences.
Also leads to more work since their needs to be a lot of characters to give substance (aside from rest of game which I would rather not talk about now).
Games like XCOM, Oxygen Not Included, and Middle Earth Shadow of Mordor (and War) get to do premade since the characters are a means to an end (the end being completing missions, gaining power, building stuff, etc.) but this game is more focused on characters and their struggles.
@DarkMesa that could work in some part. Staff are RNG since they don’t matter as much (randomise appearance, stats, etc.), but the heroes are premade since they are the important part of the game.