To be fair, I actually have like a stupid amount of airflow (2 fans, intake/output carbon filtered inline fans, and a Hepa air purifier with an anti microbial silver solution in the filter that is rated for spaces of 750+ square feet in my 4x4) and I dehumidify. If there is one thing I learned early on in my growing experience, it’s that there is no such thing as too much fresh air.
Anyway, in my circumstances, these large girls can take 1+ gallons without even any runoff on a daily basis. Not so when you’re first raising new plants. Also, I think it’s more beneficial to transplant photoperiod plants than autos. Autos I start in 3-5 gallon containers as in my experience they don’t react well to transplanting. All of the photos I’ve grown were still up-transplanted throughout their life cycle, but I’ve been really surprised to see how well the autos I’ve grown take to full sized containers (with appropriate watering practices).
I’m still a newb so I have far less experience than most here, but in my experience thus far, I really dig organics + organic dry amendments and teas. I think my future grows will be headed that direction exclusively, and AFAIK, a lot of the organics crowd start their no-till gardens and such in the final container from the get go. Something about establishing a stable soil food web and uniform moisture.