I think the point is that Rust will make it easier to distribute portable binaries. You can use Musl and then you get a completely static binary with no dependencies that works on old versions of Linux.
You can achieve the same with C++, but it’s waaaay more hassle.
There is the point you can make, which is that you can more easily create self-contained statically linked binaries (tho fish needs more than what cargo itself can provide here because it ships a ton of data files, see https://github.com/fish-shell/fish-shell/pull/10367),
and then there’s what this site keeps claiming from a misreading of a comment I made when the port just got started, which is that fish is now “available on servers”. Which is just wrong, it’s always been available on servers and it’s been easy to install a new fish on LTS distros for users for ages.
