That is a very, very tiny subset of things that are installed on any GNU or BSD system, and that need to get security fixes. Just recall the xz/sshd/system deb

That is a very, very tiny subset of things that are installed on any GNU or BSD system, and that need to get security fixes. Just recall the xz/sshd/system debacle, to patch your system all you needed was to replace libxz / libzma -- a DSO! This obviously ignores lots of other work -- but that work would have ballooned if standard practise was to statically link everything. The amount of work spent finding usages of static linkage, and figuring out which version of libxz (or whatever it was called) just to be very sure that one wasn't using the compromised version was atrocious, no thanks.