Remarkable is cool, but it has minimum e-book support. At least there should be a method to side-load third-party apps, if not a complete app store.

This product has a monthly subscription.

The nibs also run out, and life time supply only lasts as long as the company supports them.

YMMV. I have wifi pretty much disabled, only enabling for updates, I disabled when they told me that there was no encryption at rest. I am not sure how much you write, but for the last year I have changed my nib twice, so that does not really bother me. The thing is hackable and you can do whatever you need with it. https://github.com/reHackable/awesome-reMarkable