I took my Ti commuter bike/gravel bike/almost touring bike out for a ride and boom, my derailer exploded/melted/died. It's this bike and derailer setup.
I'm not sure what happened. Perhaps I banged it on something and the it hit the spokes when I shifted to a lower gear. But I don't really know.
The good part, if there is a good part, is that it isn't some $800 electronic thing, but a relatively inexpensive item. I even found one on sale and ordered it already. And I do have another bike I can ride.
The derailer I ordered is an S-Ride. It doesn't shift as smoothly as a nice Shimano derailer, but it does handle the incredible wide range of my 11–40 and 46–30 drivetrain. I wish the Shimano gravel derailer could handle a larger cassette. Maybe I could stretch it. But I didn't want to buy a derailer and have it not work and still need to buy a new one. Plus, apparently the are impossible to find. So S Ride it is...