Eh, you don't get to control the language of others. If someone wants to say PitM, that's their business.
Humans aren't computers. They have a finite number of concepts they can keep in their head. Using existing conventions leads to better understanding as it allow folks to get through a discussion without having to backtrack as often.
I care. There's no need to make challenging technical texts more obtuse to read by reinventing all the terms.