Fems do not yield more.
They are weaker on average.
They show more instability and recessives especially in following generations.
Fems are ruining the genepool. I am aware of how much they are being used and it is disturbing.
They are the results of lazy breeding that is out of touch with all sides of the genetics including Males.
People have bred this plant from a wild low cannabinoid plant into something that is on a completely different magnitude. So not all natural traits should be selected for.
For example, environmental factors can cause a plant to herm. Those are weaker plants that should be removed. In fact using dark periods interchanged with veg cycles can help you find and eliminate both intersexual traits and autoflowering traits.