well...
FWIW, Red Hat has never quite been that kind of company. RH is quite old, remember, and definitely East (nearly) Coast, not West Coast. It was never a Valley company. I don't think I've ever seen anyone in an RH office in a dressing gown :) It's maybe not shirt sleeves for engineers, but at least a clean t-shirt...in general the RH culture has always been a bit more buttoned-down than a Valley company would maybe be.
Now, the 'working from home' thing might be interesting...
(posting anon for obvious reasons)