> A fully static binary can run in `FROM scratch`.

Not just `FROM scratch` but also in other contexts. For example:

I wrote my own password manager which lives on a USB drive. Since I compiled a static binary, I can execute it on any Linux machine.

Running static binaries in FreeBSD's Linuxulator is easier. The Linuxulator is a separate set of syscalls that get used when you attempt to run a Linux binary, so a static binary will "just work" for the most part (unless the program needs special filesystems like /proc or /sys). A dynamically linked binary means I need to make sure I have any necessary Linux libraries in the proper location and the Linuxulator's `ld` working properly. Updates to these libraries can then make something that used to work, suddenly stop working. Certainly not an insurmountable task, but there's so many fewer places where things can break when you're just running a static binary.