its minimum activation range is something like 50 meters or so, and most of the footage ive seen so far has seemed inside that range

The closer the the projectile the less effective the trophy system is. A Javelin fired from 500 meters is probably going to trigger it, an RPG from 25 meters is not.

The on board computer has to detect, analyse, predict then fire countermeasures, which it may not have time to do if you pop out and 🔻🔻🔻 the tank and duck back down.