nice write by OP, and pictures too. my M8 is resting in a storage box in another country am currently living in, but am not having any plans selling it. its low megapixel count (and other limitations) makes it weekend trip not-so-serious snapping camera for me, but like OP, am feeling its still good camera to use when knowing its strengths and weaknesses.
back in 2010-11 I did a round the world trip, shooting solely with M8. looking back those photos, I sometimes tried to push it in situations where it wasn't so great, especially with low light. it was stable enough at 1/15th or even 1/8th, which rescued some shots. in Africa, I wasn't careful with sensor dust during lenses changes, which caused lot agonizing de-dusting work in Lightroom afterwards. had also opportunity to meet some of RFF folks in Tokyo and New York, many of who still frequent this forum ten years later 🙂