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