Yes they can, there is nothing preventing them creating the package. But it shouldn't be a primary way of installing package. If you really need bleeding edge for development you can build it yourself.
The priority for a regular desktop user is a nicely integrated system, and that is something that ISVs cannot deliver because they don't know what to integrate with.
For example, some folks hate the Windows way because it has drawbacks like a different installation look/feel/process for each application, there's no automatic updates (unless the application has it built-in, which most don't), there's no automatic dependencies (so each app installer has to bundle its own versions of things, which also don't auto-update), there's no single place to go to look for a program that does something you need, automated installations are hard, inconsistent, or non-existent, security issues are harder to deal with (some image library issues from many years ago are probably still in the wild, bundled into some old version of some application), ...
Please keep in mind that "just silly" is just perspective and priorities.
So All MS could do was to release a scanner to look for faulty versions, and beg people to pester ISVs about getting updates.