#Hitorishizuka. My reasoning for using my 3star arty all the time, rather then rotating to spread the xp, is that they give great performance for hardly any losses, saving my force a lot of pain. In a 24-brigade Corps I will have 6 12-gun batteries, so there's always a couple of slots for trainers, maybe just one if it's a small scenario.
I'll be sure to check out your YT stuff, maybe the action will reveal your point fully