It takes longer to develop a root system in bigger pots that are ready for HFF, high frequency fertigation.
you are using fertigation, you're just not using calculated amounts and at specific times, ergo, fertigation methods, substrate management, % volume of substrate, for vegetative and generative growth, this goes into crop steering.
And, you balance everything to scale, you're scale, you're growth space.
If I'm growing in a 5 by tent with 6ft ceiling why would I use a 2 or 3 or 5 gallon pot, I can't even grow a plant that a big, passed the tent ceiling, and I don't want to veg to that long either, of course u can Start in a small pot to get a nice root system going before uppotting ans keeping doing that but that's also time and possibly stressful for plants as well.
In a tent with 6 ft ceiling, all is needed is a half gallon to 1 gallon, if going coco+salts and doing substrate management and fertigating based on volume and plants needs.
I did half gallon coco in 1 gal pandafil bags and they grew 4-5 on last run