Continuations are "easy" (if you have decent language support or can glom it on) but that's keeping state on the server side. The author describes continuation tokens that "never expire", which is incompatible with server-side state.
Without state, a token can be a bookmark into a predefined ordered dataset. That's more reliable than an offset, but just as inflexible, and much more expensive on the server side.
Without state, a token can be a bookmark into a predefined ordered dataset. That's more reliable than an offset, but just as inflexible, and much more expensive on the server side.
Or, I'm missing something too.