> I want the debugger to show me the current line in the file, annotating the value of every variable right in the source. I want to jump to property usages. I want to automatically rename a function everywhere intelligently, not using search-replace.

But you have this with any modern language that have LSP and debugger, no? Zed,VS Code, neovim - pretty much any modern editor have those features either out of the box or via a plugin.