Yeah that is dialed like an F1 car and four degrees will shorten the life of the edge a bit. Some will do that much just under boot but go 3 at tip and tail. Another approach is to never debur and file every run. Saw that hack at a Fis GS race this year that was water injected by an over zealous course crew.
I’ve heard the lifespan thing before and never understood it. It’s still 86 degrees wide.
I guess it's because you cut away more initially so there's less edge to work with from that point forward.