I think the choice comes down to what one values more, the AMS or open firmware. I think the AMS is a fantastic addition, not for multi-color printing, but as a convenient and dry storage solution. All cloud features can be disabled, it perfectly works in the local network including live camera feed. You only loose access to the app, which I didn't want to install to my all foss phone anyway.
The X1 series uses an application processor with linux under the hood, and it was just a matter of time before it got jailbroken. The P1 series on the other hand uses some microcontroller, which can be locked down much better (and thus is not compatible with the new "open" firmware). I'm exited to see where this goes, and will definitely give up my guarantee in exchange for rooting my printer.
Your post may resonate with many people in the community, but I certain it won't with the general population. When recommending anything, it's best to focus on things the listener cares about, so tailor the message and don't copy and paste.
Use it when buying and explicitly say you accept it when selling. It's literally that simple.