Why do we have to wait for the next release for bug fixes?

So I have noticed that a bunch of fixes that goes into current or stable is not
backported to release so that FreeBSD can be updated with the
freebsd-update tool, rather one has to wait until the next 13.x release in
order to get the fixes, or manually patch and compile the kernel.

I don't understand this part at all!

Why are all bug fixes not errata'd so that users can update their systems
with freebsd-update without having to manually patch the kernel or
wait until next release of RELEASE, which can be quite a long wait.


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