Some of the features you really like could be added software based into current Prime 4 also. Make sure you make or like the requests and they might get added.
This could be in the on screen interface and could even be more advanced than the RX this way, like i.e. 7 band EQ instead of high/mid/low… or displayed EQ curve.
This could be added into the menu where you can find Mic attenuation
This is also possible by adding it into settings
Unlikely that this will happen for Prime 4 l, but technically it could be done trough the menu also
The bigger jogs and more backlighting off course could not be updated software based 