Of course tagged string literals can be compiled down to a form where no string parsing occurs. This is a really old technique; I implemented it, like many others, in PHP in late 1990s.
Vut inside an IDE or an LSP, tagged literal strings need quite a bit more special support than JSX, AFAICT.
Do you mean at runtime but only once at startup, like parsing a Lua program into bytecode? Or do you mean at true compile time like Zig and Rust format strings?
But yeah other than that you're right. I'm just talking about first-class VS Code support. Which to me means a lot.