While I emphatically agree with you, if the person doesn’t know what they are doing, following your advise can cause major havoc too.

As someone who has hosted hack days in many countries on six continents and prides himself on providing a reliable and friendly network (including hand-on supporting IoT folks) for said events, it’s really freaking annoying when someone starts blasting their AP at ridiculous power levels for their one-off use case effectively muddying to hell the RF spectrum of the event space.