No idea, but there is always a time variant. From my vantage point pugs/group leaders have every right to discriminate as much as possible when picking keys (much to the dismay of people screaming about "muh meta"), but there comes a time when it's taking forever to form a perfect group and people just say fuck it. Zero data to back this up because it's all conjecture, but in a world where you didn't have to put your key on the line you can probably afford to be less picky about who you take to your key. Not having to worry about it suddenly becoming a 14 means you might just be willing to play the game after 5 minutes of looking, as opposed to sitting there for 20 minutes plus trying (and failing to get the best group possible).
Personally when I pug keys, and when I did keys a lot I would oftentimes pug a couple slots, while deciding on the group after a minute tops. That's when I own the key. It wasn't uncommon in BFA for me to witness the same people (on Monday night) trying to get a perfect group for well over and hour, as I cycled through a couple alts.