I start all my cameras without.
Most do just fine without it. I have had to do it with two of my cameras.
But some field of views require it.
My recommendation is if the IVS AI is working for you, leave it alone.
If you start getting triggers that are false, like a bird for a human more than once, then the global config should calibrate it out.
But some people also try to do too much with a field of view or the camera is too high and even then it will be problematic.