Maybe one day we'll take the lessons learned and natively build them into the OS, but distros are still obsessed with distro-specific kludges that require extra packaging work.
We have great universal packaging when it comes from the community at large, but not from single organizations. Pip is a platform-independent package manager! Why don't we have that for Linux software in general? Because each distro already has their own solution, and they won't work together to build a common one.
By this logic, GNOME should have died a long time ago.
Focusing on the desktop makes Flatpak better at managing desktop apps. For servers we have, well, Docker.
You may be right, but I don't think you should be quite so cynical.
18.04 has a ten year Long Term Support, and Ubuntu was first released in 2004.