Hopefully we can devise tests that we can do with just a strop and razor, using our face as the test instrument - these are the conditions in which we hope to make use of this information, after all. The electron microscope can confirm our results, and provide an explanation for what we're detecting, but I'm not sure it should be the primary test. For one, it means that our results can't be replicated by J. Random Shaver who doesn't have access to such equipment, and secondly I think it also keeps us focused on improving the shave instead of drifting off into areas of theoretical interest.