Is Roger Gracie's mount-to-cross-collar pipeline solved, or are people just not committing?

Roger submitted black belts with the same exact mount-to-cross-collar he'd show at a seminar. We all know the steps. Yet at every IBJJF black belt division now, that finish is rare. Is the position now defended at the elite level, or have grapplers just gotten worse at committing to a pin? Black belts who've drilled both sides — what's the truth?