I was in Chengdu for the Heyball event and thought I would offer up some random opinions that I (currently) have as a counterpoint to some of the above comments

1. All the pool halls I saw were basically filled with 9ft snooker tables (ie these) and some 12 footers. This is basically the table any local person there plays on.
Yes, correct. Exceptions being Shanghai, Nanjing, Xiamen, Guangzhou, where there are specific clubs/franchises catering to the American game (these generally have snooker and Chinese 8 sections still). There's like 1000 Chinese table halls for every 1 American tabled hall I'd guess.
2. The clubs are busy and more and more are opening every day, so there is local appetite for the game.
Absolutely, they open like 7/11 corner stores... franchises like KK, 7+1, DJH etc
3. I saw a lot of people play a gambling ring game with 7 balls on the table, with no safeties allowed (you can pass it back if you are snookered) and similar points to the 9 ball scoring.
Zhuifen can be played with any number of balls, they usually use cards to keep score. Most common is probably 4ball. I like to play 9ball.
4. Even though it is a very hard table I saw a lot of average people playing and having fun as a casual night out event (though to be fair the club tables are not to tournament standards).
Yes, people go to beat the balls around, and take great enjoyment from talking shit and applauding flukes. I love watching people play here. There's a clear gap between these having fun, and those taking it 'seriously'
5. I have a relatively weak break but I don't have a problem with the 4 point rule (apart from achieving the 4 points that is) - it's just a rule and therefore part of the game. I have a bigger problem with giving a top female pro a one ball handicap (though, to be fair, I do view that as my problem to solve and not something to take up with the organisers).
Yes, lots opt to break into the second ball and deal with the fact there will be clusters. The top players are going 100% head on and hoping for the best, or most commonly at the headball from the side rail and looking to squeeze it into the side. Giving the female players a ball is pure sexist garbage and I hope they do away with it... Though this is "man land", and they need something to spare their ego in case the female destroys them...
6. The challenging nature of the game makes it super interesting to me. The concentration required even on "easy" shots and the pressure you feel as things get close are insane.
Love watching a good battle. DuYa is quality. If you are into cuesports, it's great to leave on in the background during the day. Reminds me of growing up when my dad would leave the snooker on all day.
7. Even very one sided matches can be fun, I practiced for a few hours with Maks Benko (15yo who beat Corey) and it was both an educational and humbling experience.
Sometimes on these tables, you have a day where things click, and it feels like any old table. On a bad day, it will humble even the best.
8. Most of the competitions are structured as two separate qualifying tournaments (a Chinese player one and an International one (incl. Taiwan and HK) to get 16 players from each before drawing for the last stage with 32 players. Chinese players tournament and International players tournament.
I sometimes think there is an element of manipulation/manufacturing outcomes in this stage. I think the seeding and qualification process needs work.
9. There were lots of Chinese TikToker's doing live commentary on matches even in the qualifying rounds - I'm guessing these people have significant followers and are making enough money to justify travelling to these events without playing in them.
YES. It's big business. I personally love watching Xue Zhengqi (who murdered me 9-2 the time I played him). His live streaming and content is entertaining. He's not one of these people whisked off to special billiards training from a young age. Just an ordinary talented human making big $$$$
10. A Chinese player started practicing next to me in the dedicated practice area. He hit the same straight shot for one hour (it was not one of the easy shots either). Someone else was re-positioning the ball and passing the cue ball back to him, so his cadence was full on. He then started to change the angle for 30 mins before moving on to break shots for 15 mins. Only after all that did he start to play 8 ball. I asked his spotter (manager?) and found out he basically does this same routine everyday and the total routine is about 5 hours long. Now whether this is optimal or not I don't know, but I do know that this is his occupation! All the better Chinese players seem to have this type of work ethic (perhaps coming from the acadamies). It looks like the pro scene in China is larger than the rest of the world and can actually support a greater number of them with pool being their primary income source.
Serious players are stoic, committed and made of sterner stuff than I ever will be. Humans made of ice.
11. They are ramping up the Heyball tournaments, there is one in Malaysia at the moment (might have already finished), and there will be a bigger one on the Mainland from June 21st. I believe there are several tournaments planned for Australia later in the year. (I've also attached the Duya (9ball) event list.)
There are also tons (and I mean tons) of smaller tournaments (with huge payouts by American standards) more than you could possibly fit into your calendar. I probably make one every two months given that I am an ordinary working man who just so happens to be OK at pool. I wish I had the time to dedicate like in point 10 that you made. Someone could pay me, manage me and I had time to be in all these events like these dudes. I'd for sure prefer it to my 9 to 5
Good points and I hope you enjoyed your time in Chengdu. It's a fun city!