There was a guy on the mephisto reddit that swore you could stop autos from flowering with HST. He grew monsters.
Some auto lines get huge and take longer, like the ripleys from mephisto. Others are notoriously tiny and would probably be a bad idea to train, e.g. strawberry nuggets.
My hangup with autos is people are crossing the auto genes into photo lines (i.e. super autos). Its one thing to breed the dank into ruderalis, but I’m concerned about the ruderalis tarnishing the dank. I loathe a future where everything is a 30/30/30 hybrid… lol
Edit to add: im concerned there are or will be breeders working with autos to reduce flower times and not being 100% open about it if at all