I know it's not a modern jet but on a 20/30 series Lear there aren't any gear pins. If you need to access anything in the MLG wheel well you have to use a tool (there's a drawing in the manual that depicts it, you have to make it yourself and yes I have one) to unlock the doors and pull them open. Someone had to be in the cockpit pumping the brakes to relieve the back pressure otherwise the NLG was liable to spontaneously retract. This was a known issue and rather than going rogue we all adhered to this protocol. I appreciate gear pins, except when pilots take off with them still installed but that's a story for a different day. Point is hydraulics might make perfect sense on paper and do unexpected things in the field. In my little world pilots are responsible for installing and removing gear pins, who is responsible for the pins on an airliner?