ORAS PH is a more popular Gen of PH and is consistently sought after in Pure Hackmons team tours (and individual tours as well).
Nice argument, senator. Why don't you back it up with a source?
(My tone may be a joke, but there is some truth to the jests)
So, about popularity. First off, the only sample size you are getting are people who actually pay close attention to the PH room, which compared to the player base of PH, is not very much. While good players are nice, and do help the format evolve, what keeps PH alive? The average players, who don't do room tours or don't even know the room exists.
A question to ask all of you. Why did you decide to start playing PH? For me, and I would assume many others, it was to put Huge Power on random shit. That's what PH is all about, chaos. And, Gen 7 not only has enough chaos, it still has binds to keep the meta from exploding (Innards mainly) As well, Gen 7 is a format where you can get away with some dumb shit. You can use random debatably-useful mons and still get away with it. Put yourself in the average players shoes. You just found out about a format where you can do anything. You create a admittedly bad team, jump into ladder...and you don't have the coverage on any of your mons to deal with the combination of whatever 2 WGs the opponent chose to use. In Gen 7, there are three easy catch-all moves that make a situation like this far less likely to happen. The Moldy moves help reduce the matchup fishness of the format, because you don't have to sacrifice a ability on MB on a mon that would way rather have something else, or hope that the coverage moves you are running on however many MMX you chose to bring are enough.
ORAS is the hallmark of balance and emphasis on teambuilding prowess.
Teambuilding is indeed more important in Gen 6. But for a ladder format which draws in mainly people not trying to take it 100% seriously, a format with more emphasis on gameplay choices is likely better. People with teams that are "worse" then other people can still win. Sure, this can be true for Gen 6, but not anywhere close to the same extent. Say what you want about Gen 7, but at least there isn't a move that is commonly used that makes you play a coin toss on if you get a turn, while dealing damage, bypassing Sub, and being able to persist for more then just one turn.
Options are great. We love options. When the switch was made from Gen 6 to Gen 7, more options were given to players. The -ate abilities got a 0.10 damage nerf, and Gale Wings was shot to death, but overall far, far more options were given then taken away. But when you want to go back, you face a problem. Generally, people don't like it when options are taken away. This would hit newer players, and players that are just in PH for the fun, the hardest. You are having fun, and then suddenly Rayquaza breaks into your home, takes the moldy moves away from you, takes the Z moves away from you, takes a bunch of cool mons away from you, hands you a move that does passable damage while applying debatably the worst or second worst status effect ever created in the generation where said stupid fucking status is at its peak, and then leaves. You would feel like you were robbed, because a lot of options were just robbed from you. All for what, CoilPass Dark Void? WG matchup fishes that we see on Moongeist sweepers on every offensive mon? A fun move that takes the options from your hands and grants them to the dark god of RNG? I know that Gen 6 is a fine meta, I played it back when it was the official ladder. (I was using a different account, so this account creation being after Gen 6 was removed is not a plot hole)
TLDR: Realistically, more people are drawn to PH for the funny bullshit, not for a more rigid tier. If they wanted options taken away from them, they would play BH or OU or any of the tiers below OU. Keep the chaos alive. Keep the freedom alive. Keep Gen 7 alive.
Edit: Also I forgot to mention, but in terms of the community activity that I can track, that being the forums, Gen 7 has significantly more posts then any other format. You could say "That's because Gen 7 is current", but I would remind you that Gen 6 was also once current, and still is losing the post game. Does this matter? No. Does it give more evidence that Gen 6 is not, in fact, the more popular gen of PH? Yes.