reMarkable (1) user here since 2019, what does the software stack look like for the Supernote? The A6 looks interesting as a form factor for someone like me that uses it solely for note taking (all I want is a "non-linear notebook") rather than annotation and reading (I use a printer and scanner for annotation/feedback and an "ancient", never-online Kindle for reading books). reMarkable has always been open-ish rather than properly open, so I would hope for Supernote to be more open to the idea of users having access to code and control over their devices (even if I never connect my reMarkable to the network).

The software support is decent. Currently it's running an old version of Android that allows you to side load apps. They are supposedly working on moving the OS over to a custom Linux build, but we haven't really seen anything with that. They do release updates fairly frequently and they have a publicly viewable Trello software development board so you can see the status of features they are working on.