There are a number of rust developers building for SailfishOs. Rubdos maintains a Signal client in rust. The toolchain also runs on the build service maintained by Jolla (obs). I'm not sure what the editor has to do with it. I use vim for most of my SFOS development but sometimes use the SDK, sometimes I use Godot.

I have no doubt sailfish is a reliable build target. I mean, can I dock it and code in an IDE/text editor in sailfish the way I currently do in osx or linux distro