Earlier quoted context omitted.
The amount of dust that would be necessary to incapacitate a mechanical keyboard would probably coincide with the amount of dust necessary to fill all the space of the key travel. Most mechanical keyboards are basically protected from dust entering the physical area of the switches due to a hat-like dome formed by the keycap itself. On top of that a lot of the switches are closed and rated for minor dust exposure (ch…
Again, I didn't specify dust. My point was that keyboards are susceptible to getting sticky from different ways. It's an accepted potential issue.
But that is not the problem. The problem is really that the keyboard is susceptible to a problem that 99.9% of other keyboards are not, even on laptops.
A complete failure of operation because of dust is inacceptable on a device that will be expose to a lot of environmental dust from being in laptop bags or having people carry them around to eat or similar.