Ceramic disk faucet valve is stiff/sticky
Machinists use measuring blocks called gage blocks, whose surfaces are so flat and smooth that you can wring them together and they'll stick tight.

Again, this requires extremely flat and smooth surfaces; this isn't something that would accidentally happen and cause a problem in your faucet. My guess is that the stiffness you feel is somewhere else in the mechanism. (If I'm right, and you figure out where, let us know in the comments.)