Nathan Lucy diagrammed Sven Fechner’s great guide on rethinking GTD contexts: remapping items on a to-do list with a framework of time vs. energy instead of physical limitations. There are few hard borders anymore between physical contexts. Most of my tasks I can do anywhere.
I know this has helped me make better use of OmniFocus contexts, a feature I’ve essentially never used because of this problem. There’s also a video of Sven’s talk included, in which he explains the approach.