your thoughts are right in line with so many before you...a good thing. There is a theory I believe is true called 'overpotting'. The basic idea is that filling an area with soil will essentially be one layer, no matter how big an area. Overpotting can lead to slower growth.
Growing in the ground is different because of the soil composition in layers. Your plants life in dirt, be it a 5 gallon bucket or a 4x6 bed, is finite and you need to find the correct amount of soil for the plant.
Factors to consider are veg time and room size. CAn you have massive plant in your space? CAn you afford the extra veg time the roots will need to fill the potting area? If you veg in the same space you flower, and don't have anyone but yourself waiting for chop day, then veg 3 months in 100 gallon g. cans and for a 3 pounder indoors. Or do some beds. Setup is easy. Put down a tarp, build box, fill with a few inches of stone and put some 1" pvc pipes cut to the top of box ( this will let water that seeps through to evap) then fill with soil mix and plant as many plant as you like. I'd do 6-10 depending on strain attributes.
They're are many other creative options to explore if you cannot afford the extra veg time in the flower room.
Good luck and be safe