Another Anti-botting system....

Not required, yes used.
Yes very useful.

I want you to show me a botter that uses their ultimate every 30 seconds they're available. Unless you mean AoE as in Ice Strike, which is a main skill that is used no matter the reason for playing the class, no botter will waste their time, sitting around, waiting for the cool down (which almost all AoEs have) to finish.

Botters have a simple-programmed system that consists of maybe 10 seconds worth of different actions. Botting is supposed to be very simple and effective, not for someone to sit there and wait for their cool downs to finish, use their skill, and then press another button to make their program continue. That would be very counter productive.