Remarkable

But why? 1GB ram is obviously enough for the rM use case of writing notes. Why would it need more?

Thinking that you nee a bigger memory just because time advances is a bit silly. The rM is not a tablet that runs applications with increasing resource demands, but a digital notebook whose computational needs in terms of function are comparable to computers of, like, 2 decades ago (or even earlier). What’s innovative about it is not its computing power and memory, but the smooth function of the e-ink screen and handwriting.