And according to standards they can do. Do you refuse them? Do you dive with them before accepting? I never did such a course and if an instructor wanted me to do it without knowing my diving, then it would be a no go. I have done dives with some instructors to show my diving, to learn to know each other. But I have never done a not requiered course.
In my country, most people don't do an intro to tech course. Sometimes it is also part of culture. Here people don't like it. And a lot of divers have a cmas 3* cert and that is already a PO2 of 1.4, so 57m or the older 60m cert. Then you cannot ask from them to do a course they already have. I am not against intro to tech or fundies, but I am against it as requirement, that is only to make money then. It has nothing to do with the individual diver that has the skills already to start technical diving.
I'll be happy to do a skills evaluation dive and if they can pass, I'll accept them into a program. If they can't, back to square one. Even GUE allows someone to test out of a Fundies course if they can pass the skills.