Somewhere in his books David Allen says that people who work from home sometimes have difficulty because, not having to separate things into contexts, they may be more likely to allow poorly-defined actions onto their lists. Having to decide what the context is forces you to define the task. For example, "contact Susan about X" is not specific enough to be a GTD next action, but "email Susan about X" or "phone Susan about X" can be.
If you have actions that you're procrastinating, they may be insufficiently defined as single physical next actions. If you don't have trouble with that, then putting everything into one context may be fine for you. If you do, then finding a way to divide things into contexts even when everything is at home could help solve that problem.
What about things to do in different rooms, or things to do when you've washed your hands in order to prepare food and don't want to get them dirty again, versus other times. What about things to do when you have lots of mental energy, or when you don't. What about things you like to do in the morning, or in the afternoon. What about things you like to do while thinking something over, like putting away clean dishes while working out the wording in your head for an email you need to do some thinking about. What about things to do while talking on the phone (e.g. stretching exercises that take very little mental capacity and would be boring to do by themselves).
Inability is an abstract thing involving comparison with alternate universes; it cannot be experienced.