Here, the Orbi advised me of the new firmware version 1.4.0.34 available last night...otherwise I wouldn't have known about it. It isn't much different, since, as the release notes say, "fixed some minor bugs". I don't use "Genie remote".
This may not interest you, but if you flash back to 1.3.0.12 and turn on the "Advanced Attached Devices" screen using the debug link you'll get the client information that you're looking for. Then if you flash forward again to 1.4.0.34, you'll retain the "Advanced Attached Devices" screen. So, if you're willing to do the extra flash, and don't do a reset to factory defaults in the process, you'll get the information that you're looking for.
While I'm not overjoyed by not being able to see what band a client is connected to without doing the above extra flash, I also don't care which band clients are on if things are working well. At my place, when things are working right, all clients (except my wifi printer) are put on 5GHz., and everything works well.
So everything is working fine here now. Even though I have the client connection information, I don't need it. And I'm not motivated to go back to the R7800, nor would I be if I didn't have the information about which band clients are connected to *smile*. Great wireless.