I don't believe my post suggested any reasons.
> it guarantees a reliable floor competency
I disagree. FAANG experience only demonstrates that, at one point, somebody believed you could do the job. There are dead-weight employees at FAANGs (and everywhere of course) who don't really have much competency (or perhaps one very specific competency that's only valuable in that specific role at that specific company, and virtually nothing else). There are also people who were once terrific, but have burned out, turned focus towards their family, were amazing at some obsolete tool/language, etc, started (or stopped) using drugs regularly, etc
I do agree that recruiters are not looking for rockstars but just anyone to fill a spot.