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I use mechanical switches when I'm making a panel or something on a device that I don't want to break after getting pressed a bunch. Membrane switches just break a lot, and for industrial applications (ie gloves, metallic dust, operating by touch) capacitive panels can be unreliable.
The tactile response is what's useful, so for people using the panel with gloves, say I want a directional control for navigating a menu I can just throw down some arrow keys and have a lot of options for keycaps if I don't need it sealed. I try to make things relatively easy to repair so using parts which are commonly available is a plus.
My friend had a guitar pedal with an alps switch as the pedal switch. I didn't know anything about mkb back then, so I didn't appreciate it, but he did tell me that it was the same switch as the ones inside his dad's kb. I now know that it was alps.
Industrial limit switches have been used to sense position of things since forever, and likely keyboard switches evolved from one of their variants.
