First of all, it looks like you don't need the stylus feature. If that is so, you might want to look at the non-Pro version, now called the Nova Plus. A little less expensive, but the same as the Pro, except for the stylus ability.
I have heard of some security or privacy concerns with Android 6. I honestly don't know how strong those concerns are. I don't use my Nova in public places, for one thing, mainly because I prefer to read where I'm alone and quiet. It hasn't been an issue for me thus far.
When the Nova first came out, there were issues with accessing Play Store. Later firmware updates have fixed that issue.
I find that the device performs very well, compared to other Android E-Ink devices I have had. The Kindle app runs, but page-turning is glitchy unless you do a simple adjustment in the Optimize menu. After Kindle is installed (and after every Kindle app upgrade), long press the app icon. In the small window that pops up, tap "optimize". Look for Animation Timeout. Tap its "none" value and change it to 300. Kindle fixed.
If you see any ghosting, you can adjust the refresh frequency for any app in the optimize settings as well. Ghosting, in general, is not an issue with the Nova. You can find other ways that you can optimize an app to look better on e-ink.
For the uses you describe, the Nova should work very well for you. I am quite satisfied with mine. My uses are similar to yours.
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