The amount you get off a plant is directly tied to interstitial node density and number, which autos can't control. You have to do twice as many harvests to yield the same weight as a photo in the same period.

Not to mention you can't clone autos, so your genetics are way too variable.

For personal use autos are a nice and easy option, not for commercial chasing consistency and yield per dollar. Some commercial growers will do auto for res, but all the flower grows are photos for good reason.