Filter use G1x Mark lll

I'm going to paste part of Marco Nero's very informative post here:

"Talking with several authorized repairers, they warned me that placing a filter directly onto the outermost element of the G1X III was a concern if the camera is knocked or dropped. Due to the minuscule gap between any inappropriately fitted filter would likely shatter the outermost element through kinetic reaction. 
. . .
Different brands of filter will have different amounts of tolerance between the inner surface of the filter and the outer surface of your lens."

Peter Bendheim had neat idea when he used a piece of paper to ensure that the filter was not binding as the lens moved in and out.  So that must not be the problem.  After reading Marco Nero's post a couple of times, it may be the part posted above that worries Canon.  Perhaps some filters have threading that protrudes further into the lens barrel than others and thus would cause a problem if the filter were bumped.  And using the lens shade adapter would ensure that nothing protrudes too far - assuming that Canon made the shade threads such that they wouldn't project too far and get close to the lens assembly.  If this is right, someone needs to do a test and see how far the threads of a particular filter protrudes into the lens barrel compared to the Canon lens shade.  If a certain filter doesn't protrude too far, I would think it would be safe to use.  It certainly can't be that Canon is worried about threading anything to their 37mm barrel threads; it would be much easier to bump a lens shade against objects than a much smaller filter.  Not that I'm saying Lightgreen is being careless     john