I don't want to have to mess with keeping different batches to shoot in different guns, to me it's more time and trouble than it's worth. I use precision mics to measure my cases before and after firing and before and after resizing and I have not had any issues with shooting the same load and brass in different rifles. Same with case life in an AR service rifle, yes it gets beat up a bit more, but I'm getting 10+ reloads from every batch of brass. To me it's more productive with my time to save time on reloading and more time practicing and competing.
I should mention that I'm loading length tolerant bullets so I don't need to be concerned about seating depth as much. I'm loading 75 BTHP Hornadys in .223, 175 Sierra MKs in 308, and Hornady 140 ELDMs inb 6.5 CM.