Yeah, maybe it's added protection, maybe the treatment is BS, either way, I'd probably go for the new frame.
I was going to send a factory 17 rounder with it. Now, I'm thinking I won't since the RMA says "inspect frame for damage."
Given your track record, I'd want to hold onto that warranty as long as possible
I don't have any expectation of "swag" or other things (one guy said CZ sent him a stack of free mags); if they swap out my frame I'll be satisfied, anything extra would be icing on the cake. Better be closer to the "4" rather than the "6" side of things in terms of repair though.