[palmotea]

> Teachers typically also have years, sometimes decades, of experience running exams. Yet I've never seen a teacher that is any good at stopping cheating. And that's in person for the class that they are teaching.

The difference is running exams is a small part of a teacher's job, and almost certainly not the part they're passionate about.

Also proctors demand things I've seen no teacher at any level demand (or be able to demand).