I looked at the Remarkable and Scribe almost went that way but ended up with a Supernote A6X. The only outside app it has is Kindle, go figure.
I bought the device to replace my notebooks though. I have a dedicated Kindle Paperwhite for ebooks. But it is nice to know the kindle app is on my supernote in a pinch, so I can see why you'd be questioning the Scribe over your Remarkable.
I think the RM probably does the notebook thing better than the Scribe currently, but maybe that will change in the future.
Do you currently not have a dedicated ebook device for reading? Or do you just like the idea of a single device to do it all?
Personal I like the separation but I can definitely see why people want one less device to schlep around.
Personally I like my eink tablet being separate from my reading device. And I do like how Supernote has mad their device really tailored to people who write mainly vs trying to be an all around tablet device.
However, if Amazon offers an A6 Scribe in the future I may be tempted to pick one up...