rms (Stallman) used to (still does?) do that where he would download the web requests and emails on a daily basis and then work offline the rest of the day and then sync overnight. At least that's what I remember reading.

I remember thinking about how different that workflow is but it must be incredibly productive. Everything would be lightning fast (even stable Internet isn't always snappy and sometimes it's a chore) and there would basically be zero inline ads or any context switches.