I don’t know why gear pins and such are something seemingly foreign to many pilots. Growing up in mil jets, there were pins we pulled on preflight as pilots, and other pins that were pulled in an arm/de arm area by crews there. If the jet was empty of any external stores, or we were at a field where there were no end of runway crews such as a civil field, then it was up to us to determine that all remove before flight pins, including the ones we normally pull ourselves, were removed and stored in the gear well stowage box. We also had to know how to fuel the planes correctly, ie- using the external fuel panel, as you’d come to some civil fields where they weren’t fully familiar with that particular aircraft type for fueling and servicing purposes, such as the need to pull oil samples and the like. It’s nothing unusual to me, but I fly with a number of pilots where this is foreign to them……even seeing a plane with gear pins ever installed is foreign to them. Whereas to me, seeing a jet parked without gear pins in, is foreign to me.