You left out the biggest "con" of all for the KS, at least for me ... privacy (or the lack thereof).
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amazon monitors everything you do with the tablet (or any other "kindle" device), and uses that information to build a profile to target you with advertising.
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If "google play" or "firebase" are installed (they come pre-installed on most android devices), google also monitors which apps you run (whether downloaded from their store or not), and in some cases what you're doing inside those apps ... again, to build a profile to target you with advertising.
I have not seen anything to indicate that reMarkable is collecting or sharing information about how people are using the tablets (although the fact that the reMarkable Connect "cloud" is hosted on google's cloud makes me not trust it, because the files it stores are not encrypted).