That's why there are choices, some like them small, some like them big. In Canada you can grow 4 plants outside. Think most people would want big one's over small ones.That's debatable. Most people I know grow Auto's for a fast turn around. Doesn't make a lot of sense to grow Auto's Indoors for months & months using more electricity when you could grow a Photo & use less electricity in the same amount of time.... or even less. Growing outside a longer running Auto would probably benefit from the longer Veg time. But I think indoors it would be more costly & therefore not make sense. I actually have a few strains of Auto Seeds. I'll be putting them outdoors end of March. I'm in AZ. so by the end of June it's over 100F so I sure as hell hope they finish in time. It'll be 110 - 120F come July & most likely too hot to grow outdoors. Would probably be better to start them around mid August as I'd have at least 4 - 4.5 months for them to finish before it got too cold.
Photos don't work here unless you're on the coast, you cover or have a greenhouse. And then it's still a gamble on mother nature.
In the early days autos were small but today is a whole new ball game so buyers beware you might get more than you bargained for
Also with all the breeding going on, you're gonna get mutants