uhhh yeah...i constantly see bolt hangers shearing biners
I also see swaged wires on nuts cutting biners all the time...
...actually, i think a girth hitch works like a knot in that some of the base material is compromised by the knot...i don't have the numbers, but a figure 8 fails a rope at something like 90% (again, i'm pulling out of my ass here)...
there is something to be said for the relative melting issues (kevlar/dyneema/nylon) and from absolute melting issues (ie rope running over sling)...
My personal opinion...in the middle of a route with a fair bit of gear in, a relatively low fall factor, and a bunch of secondary pieces below the top piece, i wouldn't give it a second thought...right off the anchor, i'd be a little more "judicious"...
absolute rules/dogma is for the brainless...
Carry on...