I don't know about Larry, but the wireless MIDI concept is 100% important to my all wireless setup.
I plug the MIDI in/out transceivers in to the BK and 8X, and along with my wireless stereo analog transmitters means I am free of wires while recording, gigging or going for a glass of water without needing to take off the accordion because of the wires and they are completely reliable within a 40-50 foot circle in my tests.
It also means that at the same time I can comletely reconfigure my 8X *and* BK7m by simply having them wirelessly attach to the bluetooth of my iPad and change the 8X, the BK or both by simply flipping a page in SongBook Pro on the iPad or pressing a single button on a bluetooth pedal that I have set to turn the pages of songbook. As Larry also shows, a couple more BT pedals can take the place of the 7-button FC-7 pedal if desired for not much more than the cost of the hard to find FC-7 wired pedal.
The new firmware also means that one can group items together, which means one can connect items in to MIDI groups and avoid misconfigurations or clashes. Example... 2 8X's using your BK or 2 different arrangers used with the 8X and no wires in sight... just a couple of ideas.