I mean the fix is toggling a single environmental variable from True to False, on a system that isn't normally accessed by customers, so the risk is really small in rolling out the change.
Sometimes you’re lucky if a company reads your report in this time but of course I would expect and we generally see much better from the likes of Facebook etc
They could deploy continuously, but deploying to PROD doesn't include minutes/hours/days/weeks/months of investigation, testing, documentation, verification...