I think
@wil2279 covered most of it, especially #3 referencing cloning and consistency as a production requirement. Growing from seeds tends to have consistency issues in general when compared with clones, but auto hybrids are bred from three sources (with the addition of ruderalis in the mix) and I've had unbelievable variation between plants that came from seeds from the same packet. I guess a lot of seeds are rushed to market these days, but it seems like when your phenos can lean more towards ruderalis or more towards photo spectrums, that adds a whole other set of variables to the equation.
The only thing I would add is that from what I've seen, large scale/commercial growers are also relying on "bag appeal", and the autos I've grown (mostly Mephisto), while frosty and potent, don't have anything close to the bud density of photos. For me the 'larfy' buds are a benefit not a problem, because I grow them outdoors and they are less likely to get moldy with more open bud structures, but commercially it seems like people are stuck on dense buds being synonymous with quality.