I can’t speak for others who want the same feature, but for me at least, it’s purely referential.
Every once in a while I’ll get those gold nugget conversations that end up providing extremely helpful info that I refer back to multiple times, and it’d be nice to have it up front and center so I don’t have to sift through things constantly.
I’ll also occasionally develop a useful prompting technique, and I forget which conversation I did it in, so I end up having to dig around everywhere to find it .
In the meantime, I mentioned this in another post but I’ll occasionally edit a convo’s name with a star or something at the beginning so I can at least mark which ones I thought were important enough to refer back to.