Yes, this. A friend of mine used to write really epic backstories, and another friend said that it didn't make sense to do that, "because the most interesting thing in their lives have already happened to them, start and finish".

I think for some people, this type of immersive pre game play can help them get in the mindset of their character But most of the time is see it cause confusion when They’re not able to be flexible enough with those ideas in play Or Play clashes too much with the ideas they’ve come up with