This more of a bug fix than feature.
When I start my workout, I select autofill stats since I'll come close to the reps and weights or exceed them so that I don't have to type in a bunch. I love this feature. But if I change any of the stats and then near when my workout is over, I might edit the workout. Maybe to add an exercise or substitute an exercise or shift the order, then the stats go back to the original data wiping out any changes I made.