This is the only thing I question, given the mix of data suggesting the opposite is true. Stanford ran a project about it some time ago: https://cs.stanford.edu/people/eroberts/cs201/projects/crunc...
That may boil down to execution, though. That project emerged out of pretty scathing posts from the boiler room programming environments of EA. I'm pretty confident Google operates very differently, and probably learned from those calamities.
We know that over work reduces creativity and productivity. Hell, as an outsider you can practically see this in what Google offers; they’ve totally lost their way and keep rehashing the same products in repeatedly inferior ways.
Rather, I think that they feel that it’s more productive or that it gives them more control. Neither of which is a rational argument