I agree but I don't think the software packages themselves should be held back by the available time and attention of packagers. In the new world a packager or distro creator can just pick and choose what flatpaks, snaps, appimage, etc. sources they deem good enough to push to users. They shouldn't be a roadblock in the way of users getting the latest version of software.

Then you install the new version, find out it requires a new version of python and all its libraries, but you can't install it because pytorch only works on old versions of python.

That doesn't happen when apps are packaged in their own containers with all dependencies. The new version you installed has its own python dependencies.