Promotion is always active and helps battery life the not much movement on screen, like reading emails. Although there is supposedly tiny blooming effect but have to see it in person.Interesting. The extra size and weight compared to the Air and the notch may just push me to return the 16" and keep the Air. I also am not clear how much BS marketing has played into ProMotion on the MacBook Pro screen: is it ProMotion only sometimes? etc.
To me, the difference is $1200 between my air price (used) and new pro. 80% of time I'm looking at an external monitor anyways.