In addition, I often download articles from https://www.instapaper.com/u; the reMarkable 2 often malforms them, in ways other e-readers, including Kindles and iPads, don't.
I infer that reMarkable's scheme and hope is to sell monthly sync software, but this plan works poorly with my e-reader workflow and, I'd guess, others'.
Probably there are ways to get around these limitations (and, reading the thread, I see some people listing rsync and such), but they're so annoying out of the box that I wish I'd not bought mine.
1. It's big enough for PDFs. 2. It's a relatively open system (compared to other e-ink readers), so it's pretty fun in terms of hackability.
I did get the forever free subscription which helps, but I also totally understand why they would want to charge for that, and I think the new $3/month is a pretty reasonable price for it.
Regarding instapaper use case and also hackability, shameless plug: I wrote https://github.com/fishy/url2epub for my own use case, so instead of relying on a third party service and manually sync stuff to reMarkable 2, I just send the link to the telegram bot (I picked telegram bot so that I can easily send links from my phone, not only desktops), and the epub will be auto synced to my reMarkable cloud account (they did made some changes to the cloud api causing I have to manually open their official mobile or desktop app to sync once before the reMarkable 2 itself would accept the new epub I uploaded through url2epub, haven't figured out how to avoid that yet, but it's still mostly automated).
Works pretty well.
You can install koreader or plato on it, which turns it into more of a traditional ereader, with good ePub support. But occasionally you'll have to reinstall the launcher you use, because there is no officially supported launcher and the option to disable updates doesn't always work.
I wouldn't personally recommend an RM2 as an ereader; there are better options.