I keep trying autos every now and then, but it seems like if they aren’t grown in soil they get enormous. Even in small pots of hydroton, or small amounts of rockwool/coco they try to grow like they have tons of root space. I’m impressed with people who keep them small. @Mr.Sparkle comes to mind here, but I think he uses 1 liter of coco per plant and maybe less. He proves you can make them work in soilless in small spaces. However it’s not easy and only certain autos can be grown that way, unlike 12/12 from seed photos where even Sativa doms can be kept small.
I got pretty annoyed with autos in 1 gal pots of hydroton. They take as long as photos and you have less control over size. My 3BOG was almost 40 inches tall and filled a 2x2 tent in a 3.5 liter pot. Took more than 90 days to finish.
On another forum a friend grew an auto in a solo cup of rockwool and it was pretty much full size.
Not knocking autos though, the 2 I grew recently were great. Probably 2 of the best plants I grew in the last year as far as terps and potency AND the yield was on point. Just difficult to grow them the way I like, which is in hydro/soiless SoGs.
That’s actually part of the reason I’m investigating 12/12 from seed.