I would love to see this happen on DEN Center when everyone who diverted is making a mad dash to all the arrival gates and is stacked up 10 apiece at each STAR fix. Center would lose. their. shit. if everyone reported established in the hold.
Exactly my point lmao. When there are 5 legit, and one air force training command in the same local area, ATC is telling us when they next want to hear from us. If I were an airline guy, I'd report established. When I'm one out of 5 military aircraft holding at SQWID at KMOB "for training," won't, if I were told to report when ready to commence the approach. I actually tell my students to just ask their instructor before reporting; being recently flight-side I would rip the PCL from their thumb when they tried to do it.
Mobile Approach does not want to give legit holding clearances to 75 planes per hour. Which is why they don't. They don't give me an EFC, they tell me to report when ready to commence the approach, that's what I do.
BONUS note: Sherman field doesn't give lost comm instructions during PARS! Probably a FAR.AIM violation. But they only do like 300 per day.