How can the same software be in a beta state for hardware A and in a release state for hardware B ?
I would understand if hardware B was older than hardware A, so you could say that the software is beta for the new hardware because of the new features. But since as we know, the stage is the new hardware, this doesn't make any sense.
The reasoning is that it was not possible to sell a device with only beta software, so they decided to call it release instead, but the stage is indeed sold with beta software. Which makes me think the stage release was rushed (for financial reasons ? ).
Well, it is also possible that they did much more thorough rounds of internal testing for the 7.0 software against the new Stage hardware, than what the did/usually do on the Toaster/Racks for which they can also "outsource" big part of the testing to the big user-base willing to instal Beta releases.
The release of the Stage may have been rushed or not, but as a new piece of hardware running complex software, it is not at all unthinkable that the first versions of the software will have bugs that the users will run into, that weren't found in the internal testing, and that these will be quickly solved.
Regarding the different naming convention (Release vs. Beta) for what appears to be the same software, it makes sense when you consider that there is no 6.* version of the OS for the Stage to be considered the stable one. A beta release warns the user: "This is not the version that Kemper recommend that you have installed in your hardware for the most reliable performance. You should only go ahead and install this software if you can put up with running into a few bugs that you are likely to find. Otherwise you are better off staying with the latest stable release for now".
For Stage users, the recommended version for the most reliable performance is the latest 7.0.x update, and there is no reason not to install them. Calling those Beta would actually be more confusing, and may prevent many users from updating. And this, in turn, could imply a longer time for bugs on the Stage to be found and subsequently fixed.