I feel like the fitness industry is to blame for this, not the individual, by any means.
I do remember from my personal training course that your practical session for your assessment involved a few stretches (of different types, static, dynamic, etc.) a warm up on a cardio machine, (a re-warm which no one really does unless you have watch an exercise demo for example) and then some cardio training of your choice.
Then you had to do some weight training exercises on machines and free weights comprising of a hell of a lot of variations (super-sets, giant sets, etc.) then maybe some accessory work and some more stretches.
This is the industry standard. What a lot of personal trainers fail to do is question WHY you do this. One guy on my course actually asked, “Why do you have to do that when you’d never structure a session like that?”
I feel like my tutors were really good given that they actually told us, “do this for the assessment and then forget everything you’ve been taught, and start learning again”.
Being in this industry, you should be continuously learning and educating yourself.