Regarding Motion Sensor: the creator has stated that first playthrough after a hard reset always starts with one, to let players learn the basics of herding enemies, and second (after the first soft reset) always starts without one, in order to avoid players leaning onto that upgrade too heavily. After that it's random.
I'm not sure what trope does that fit. Crutch Character, maybe?
Regarding Motion Sensor: the creator has stated that first playthrough after a hard reset always starts with one, to let players learn the basics of herding enemies, and second (after the first soft reset) always starts without one, in order to avoid players leaning onto that upgrade too heavily. After that it's random. I'm not sure what trope does that fit. Crutch Character, maybe?