I mean OS updates are necessary, from security updates to support for new hardware. Stuff like init scripts were a suboptimal solution to begin with, it is not like that old stuff was a good solution. Xorg also doesn't fit how modern computers work, and is merely a collection of bandaids that is inherently unable to reach sane security by todays standards. So its not like progress is entirely superficial. And also with Flatpak there has emerged a way of shipping stuff such that used libraries can be shared but do not have to be, and every app can move at its own pace without conflicting with other apps or the OS. So at least in Linux land, especially in the last couple years, there has been great advances from a technical point of view. And those tackle also the problems arising when a huge number of indipendent parts come together, which were naturally very pronounced for Linux in the past.