Arguing home study is like learning to be doctor using DVD is as bad as modern certified Yoga teachers, who do not live the yogic life, claiming to be yoga exponents.
If I can be to allowed throw away the Yama [moral codes, Niyama [self-purification and study], Pratyahara [sense control], Dharana [concentration], Dhyana [meditation] and Samadhi [absorption into the Universal] and just master only the two broken limbs, Asana [posture] and Pranayama [breath control] in a commercial yoga institute, personally trained through a RYT 200/500 certified trainer, do you think it is better than self-learning?
Yoga was about a century back learned and perfected by Gurukul practice. If that has become a mockery, it is time to accept that in-person training through commercial institute is also a mockery.
Take it easy David. If Yoga is just Asanas and Pranayama, you don't need a personal trainer. If it is a way of life, it is PREFERABLE to have a real Guru to live with and learn.
Just jumping high and above and bending back and forth and holding breath can be performed even by kids in high school gyms.
In other words, let us discuss from the bottom of our heart, how many institutes run BY RYT 200/500 certified trainers have real trainers who live and follow eight limbs of Yoga. MOST OF THE OCCASIONS, Yoga institutes focus more on being a socializing clubs for singles and forced singles.
If I am a true yogi at least by mind, I will avoid socializing too much through a routine yoga schedule to avoid sense dissipation and thus will truly enhance the practice of Pratyahara.
It is just perception VS commercialization, whichever is convenient I may speak and advocate for.