Can I ask, as someone completely outside the industry, why can't this be open? Most users don't want to fiddle and you need to make things just work, I get that for sure. But if I could choose my own syncing service or hack around with the reader software I would buy this in a second.

I don't mean to pick on reMarkable alone. I have the same complaint about Kobo. Does a locked down operating systems really do anything for the bottom line of this company? This is not snark and I'm not judging, I am seriously asking about how hardware companies make these kinds of decisions.