I honestly don't think that's the reason, they can limit the amps and the cabs to what resides inside the Kemper Hardware, could they not?
Not even that. Just a "Remote Control" for the Kemper would be fine. I don't need the Rig Manager Part integrated (but i'd take it). I'd just like to be able to adjust amp settings, add effects and edit their settings and and maybe some of the system settings. I just hate that i have to use the small display and nested menus for testing all the new and shiny delays we got with 5.0...