I do an evaluation dive. As itt is not required, i will not go to an instructor who makes his own rules.I've had too many people come and try to do it in 4 days and when I stopped the class on the 2nd or 3rd day, they got upset. So now, although standards allow otherwise, I won't take someone into AN/DP that hasn't completed an Intro to Tech / Sidemount or Intro to Cave program.
But i agree, some are not prepared. The evaluation dive works well and then you know if itt is needed or can be skipped. Look at the individual.
I have done my own courses also, and now do it as instructor.
Some really need itt, some dont.