Static linking has benefits, but from a distribution standpoint it makes handling security updates (which people expect to be done correctly and in a timely manner) a HUGE pain in the ass.

You want to go statically link your internal rust binary that you are pushing out to hundreds or thousands of nodes and you need the extra performance? Go for it, you can handle rebuilding it every time there is a security update (and last I checked dylib's allow both static and dynamic linking against them, so you have that option). But if you want to include your binary in a distribution package repository it really should be dynamically linked, tracking what dependencies everything has and forcing rebuilds and updates for EVERY SINGLE BINARY that uses them is wasteful and a pain to manage.