I'm exploring the following hypothesis : sometimes, you have to give up constructive actions for the sake of focus.
I would try to make the hypothesis a bit more concrete. Something like: flow, immersion and engagement are all important factors in productivity. An implication of this is: (your hypothesis here). You should of course look at the literature and explain what flow, engagement etc. is and how it relates to productivity.
If you want this to be interesting, then you should probably also try to find some implications that people normally don't think about because they're not strategic. Maybe, things like that you should: remove clutter, have the right perspective, exercise, practice, gamify things, learn how to beat akrasia, learn when its a good idea to relax etc.
The cfar class called turbo charging training which I described here seems to be related to your hypothesis . The underlying idea of it is the rule of intensity which states that the experience of intensity or effort that you are expending to learn something corresponds with the rate at which you are learning it.
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