I’ll just add a minority opinion for the hell of it, that I like the grip safety. I have no problems deactivating a properly tuned one, I know how to tune them myself, and I like the additional layer of ND prevention for holstering AIWB. With a holster that traps the safety, me riding my thumb under the safety until it hits the holster’s detent for it, then switching my thumb so I’m both trapping the hammer and getting my hand off the grip safety, I can’t think of a safer AIWB holstering option.
Anyone taping theirs, that’s their call, but I’d personally exhaust the tuning options first.
I know nothing about military use, but it seems possible that those guys may be stuck with how the guns come from Colt, with armorers who are unwilling or disallowed from taking material off one of the gun’s safety devices to address an issue that some but not all of their people have with it. In that case taping it down makes sense, but it would also be another one of those areas where military practice just doesn’t apply to civilian contexts.