That's just how big companies roll out software changes for software that auto-updates.
It's much preferable to be able to instantly fix it if the rollout of a new feature goes wrong than have everyone who installed the broken version bring stuck with problems until the company realizes the issue and rolls forwards with a fixed version.
I've used feature flags extensively throughout my career as a SaaS developer, but I've never considered their usage in desktop software. Not sure how I feel about it.
Desktop software is like web-based software, except there's no sandbox or anyone trying to protect your privacy.