I'm not sure if this is the right place to ask, but I'm curious about what contributes to the asymmetry of force-distance graphs provided by keyboard switch manufacturers?
For example, it is common to see graphs that look like this online:
Accompanied by gifs of the mechanism like this:
The mechanism here and what I've seen of actual keys look symmetrical in that there's no reason for any difference between pressing the key and the return of the key. So why is there the reduced amount of force on the return?