I believe horses are much more capable of achieving than we are capable of inspiring them to achieve.
Confirmational Bias
It’s hard to ignore that some trainers are leaning on science to explain and justify their training principles and methods. However, none of the trainers I am familiar with have a background in science and research. None that I know read the peer-reviewed literature. None of them appear to have the depth of knowledge to gauge the merit of the science they are relaying. They depend on a third party to explain it to them in a way they can slot into their training and teaching.
Commitment When Starting A Horse
A few days ago I was talking to a trainer. She was telling me about the pressure she felt meeting the owner's expectation to have their horses going home trouble-free under saddle in just a few weeks. She said most people expect the job completed in 6-8 weeks and Flossy to go home ready to take on all challenges with a smile.