As much as I don't agree with the overall degree of gatekeeping people use in PF (see also the "passport checking" pandemic this raid tier), it is the end result of people joining parties when they don't have the experience the description asks for. Nothing's stopping anyone from just making a fresh or even blind prog listing. They just fill slower and have a much higher failure rate which is a deal-breaker to some.

I got dropped from a discord last tier because I mentioned I'd cleared the tier on my main and one of them threw a hissy-fit over some Tomestone thing then booted me because they couldn't handle the idea that they might have scooped up a player with more experience on a fight than them. There's arguments to both extremes. For my part, I just wanna play the game. Because it's a fun game when that chocobo dung isn't happening.