"the whole thing's a wash" Truth. However, alternative theoretical models can be constructed for possible experimental tests or at least anecdote collection.
Surely all progress comes from the unreasonable man. Also we only hear about the most famous / rich creative geniuses. I have no particular problem switching off creativity and hanging out (going hiking or something), I am also not famous, not even internet famous. That would lead to the theoretical model that famous people can't shut off their unreasonableness, perhaps at all, which makes them completely cantankerous and anti-social yet also somewhat more productive than better balanced individuals. All kinds of interesting experiments could be devised. Are they able to shut anything at all off, or are they OCD/addicted personalities? If someone who can shut off is converted intentionally or otherwise into someone who looses control of their creativity, are they more successful? College binge drinking to emulate an alcoholic might be monkey see monkey do emulation of creatives... does someone naturally somewhat creative who gains an uncontrollable addiction have the bleed over into uncontrollable creativity?
Another interesting model revolves around the only socially rejected people the general public ever hears about, are the top of the line creatives. That probably tells a lot more about our culture than about the individuals. For example, I suspect the panhandler at my freeway onramp is socially rejected, at least by most, its just "we" will never hear about him unless he becomes a famous painter or poet. Given his cardboard signs I think he's not creative at all, at least not WRT the graphical arts, yet he's got more rejection than most of us. IF most people are socially rejected to some extent or another, thats kind of the purpose of mass media and big cities after all, and the only rejects we hear about are creatives, then a very weird conclusion could be drawn that creativity only comes from rejection, although the reality is almost everyone is somewhat rejected. Much like they all drink water and all creatives drink water so creativity obviously comes from drinking water.