That's a great idea for larger, more massive mirrors, Don. It's the same solution used for coupling slightly mis-aligned shafts. Not truly "floating", but it does allow some pivot motion.
Stiction doesn't seem to be a problem with these smaller mirrors. A little graphite keeps the float pad loose enough. A similar mechanical pivot on my old Novak 17.5" cell is still moving freely when it has to.
We've really sidetracked from the OPs question, lol.
I disagree on everything you’ve stated. First this is not the same compliant mechanism as is used to couple mis-aligned shafts. This mechanism allows for tip-tilt but not for axial movement.
Second it is truly floating w.r.t. to tip-tilt. Another type of solid machined compliant mechanism replaces the Nylon mounting pads that allows for sideway “floating” without stiction or need for lubricant such as graphite. In addition there is no need for a perfictly smooth and flat mirror back in order to float since all lateral movement is inside the solid and does not depend on a smooth flat surface to slide against.
This compliant mechanism works as well on small mirrors as on larger mirrors. Guess compliant mechanisms don’t fit your paradigm of how stiction works to inhibit movement at the nano level in the real world.
BTW I only responded to your sidetracking of the Ops post.