A stable release for the Raspberry Pi would be awesome! The use case I have in mind is education.
Now if you want to teach kids to code in Swift you usually need a Mac which is pretty expensive. Raspberry Pi support + LSP would enable teaching Swift on the Pi using VSCode which would be a low cost and very nice learning environment. The Pi has a rich teaching ecosystem with resources and fun experiments you could do with periferal hardware.
In short, if it’s not a huge burden on the core team, I am a huge fan of an official ARM64 support.