After half a dozen days with the 6e and after 5 years with the MX30, I can make some comparisons...
Compared to the MX30, I only miss the smaller size and the LED matrix headlights, a working radio with high-quality range, and not having to wait for the list of radios to be updated the next day.
I miss the paddle shifters, and unlike in the Mazda 6e, the cruise control always worked flawlessly. Most importantly, everything in the car was the same the next day, unlike in my Mazda 6e. Of course, the 6e has a 10-0 record against the MX-30, but that's not enough for now; I want a 50-0 record...
