I used to grow big plants outdoors. They veg quite a while and outdoor yields can be 20lbs per 20ft plant.
I now grow old school "Sativa" indoors, the loose growth allows more light to penetrate. So everything is 7ft and the canopy nearly reaches the soil. No larf because they are fed properly and we don't dim lights to bandaid nutrient issues.
Anyone growing a flat canopy is wasting time with veg. The concept of a flat canopy is outdated. If your canopy is shorter than the shaved legs under it, you've wasted time. More surface area exposed is the goal. 2D is the smallest surface area in a 3D space.