Hi David
Thanks for the kind words.
Regarding the exposed sensor, I have been using mirrorless cameras since the Panasonic GF1 came out (cannot remember the exact year but I think more than 10 years ago).
I have had a number of different brands: Olympus an Panasonic mft, Sony FF and APSc, Canon M series and Fujifilm APSc and all had the exposed sensor and it has never been a problem for me.
I am not gentle on my gear but respectful that they are electronic items with some very sensitive parts. When I change lenses I do it as quick as I can while being aware of the conditions I am in. So I ensure I keep the camera down so nothing falls into it or gets blown onto it and where I can I use my carry bag for protection. So far, it's worked well for me (fingers crossed lol).
I did get a big dust blob on my old Pentax DSLR once but managed to blow it out.
Cheers
Paul