While it definitely is not of our business, surely, over the course of several years, someone can find a place where they are comfortable to write. I bet his publisher would even help pay for an office space, an extra apartment, comfortable decor, whatever.
I love his books, but I've never bought this "lack of writing space" excuse.
Except it's not just "lack of writing space" -- although that's a Real Thing, and it matters (N.B. he DID have a writing space. It just wasn't
his space (the same way a rented office wouldn't be); rolling out of bed in the undies to get a critical, dream-inspired hour of work in, from 2:45-3:45am? Not in a rented office! Blasting Ride of the Valkyries at feel-it-in-your-bones volume, to write a scene with Gard? Not in a rented office! Etc... ) .
Yes, spaces can be had, but (as I understand his situation) he was more or less expecting his (own) new space to be completed "within a short while" for at least a couple of YEARS (bad contractor), the actual "need" for a separate office/whatever wasn't really clear for a long time.
But even so, such temporary spaces are not the same, and not likely to be an equally-productive space.
And the book DID get written; just less-productively than we (and he, I presume!) would want.
But -- in addition to the "room of ones own" -- his marriage ended, his dog died, he found new love and got RE-married ...
Someone can go work retail, or a bunch of other jobs, largely without regard to their "internal state." They may have a spate of late-arrivals, their productivity may dip a bit, from a crying-jag or situational depression. But basically, they grind on.
A creative worker is a bit more limited; their productivity is
profoundly impacted by their "internal state." Mr. Butcher has stated that he can and does "grind on," just v--e--r--y s--o--w--l--y (and so we got the book after an unexpected delay).
I... kind of don't see why anyone would expect anything else, given his circumstances?