I scratched several dies not getting case neck clean enough. Yep they were replaced for free. Clean cases and I Never replaced a die in last 30 years for scratches.Your cleaning process makes good sense to me however I keep hearing from guys saying they never do or they stopped doing. I'm definitely not apposed but I like simple and if I can do it without cleaning that's one step I'll remove.
I don't load a lot. My highest volume die 223 I only load about 10-15k a year on. Just a RCBS 3 die set.