I doubt anyone at Apple was sitting in a meeting and was like, "I hated all my teachers in school, let's make it impossible for them to use iPads as presentation devices", and then everyone else agreed with them.
It's also quite possible that there is new under-documneted and opaque way to do what the teacher wants to do.
It's also quite possible that there is new under-documneted and opaque way to do what the teacher wants to do.