I read this in Ed Rosenthal’s book. Since I wanted to test a few seeds from my own production that didn’t look quite ripe, I conveniently had three seedlings to try the whole thing out. According to Rosenthal, you are supposed to be able to increase the yield this way.
Normal yield = 1 plant
More yield = 1 topped plant
Maximum yield = 3 plants in a pot
My conclusion = Outdoor it might make sense, indoor you save time because three plants fill the tent faster than a single one. Yield-wise, however, it comes down to the same thing. The available area is what determines the amount. What you save are seeds, soil, and electricity.
If you buy seeds, it might not be the best option. If you produce your own seeds, it doesn’t matter.
Regards