That's what a backstory is though, it's what happened in their past, before you met them. If you're experiencing it with them then it's their current journey. I did feel like I was able to reach meaningful and entertaining conclusions to all of the companion's personal stories after hearing their backstory. But I never played any of Larian's other games, so I don't have anything to compare BG3 to. For me it was a completely new style of game, and one I enjoyed so much that I consider it to be a masterpiece, and the best game I have ever played. That's saying a lot considering I've lived through the entire evolution of gaming, starting out with an Atari in the early 80's.