And this is based on which piece of research?
Most people go solo when their instructor deems them ready. I dont think you will find it easy to find any instructor willing to let anyone go before they are ready, based upon a thorough assessment of the pupil.
After all the mountain of paperwork to get through if something goes wrong is so big that it would put anyone off.
May be Mr Robinson's real strength is designing helicopters.
MHO of course others may have a different opinion.
FD