Lack Pain and Suffering. I'm retiring next week after 45 years working at a Research Lab, spent the 1980s working with digital imagers. Cleaning out and moving offices, work and at home- found some slides made on a "Dicomed" computer camera, from 1983. I wrote the software to correct a resistive coupling problem in the Array, and to find and correct bit errors introduced by the data acquisition system. That was fun, and they paid me $50K a year back then to do it. I was in my Twenties. I still write an occasional piece of Fortran for my Leica M8, M9, and M Monochrom. Because it is fun, and always a constant challenge. Don't get paid for that code, but still get paid to write code. Even after next week.
I'm going to go with a Nikon Zf with the 40mm F2 lens for a retirement present, and buying some classic Zeiss and Jupiter lenses. I looked at the M11 at Popflash, "renewed" at a really good price- but passing on it. I just do not like the fact that it uses the main array for metering. So- it's a mirrorless camera with a built in rangefinder. The camera at Popflash cost less than my M Monochrom did 10 years ago, and about 1/4th the pay-out for unused leave. If it had a real meter in it, I'd get it. It does not, pass. The Nikon Zf- classic controls, uses almost all of my lenses, and a lot less money. If my M9 died: I'll be looking for another M9 as a replacement. after all, I have all the code written for it.