Well my point is that GTD contexts also provide little value in general for most people with smartphones. They force people to pointlessly over analyse actions and waste time organising tasks in the system instead of doing them. And then those contexts don't even help to decide what to do in most cases.
Should I use macbook as context or maybe iphone or maybe ipad or maybe starbucks or maybe commute or maybe writing or maybe home or maybe something else, etc. etc. Or I can just write an action or project without any context and that's it. Think about how much effort and mental energy I'm saving. Instead of figuring out the perfect setup I'm actually just getting things done.