Looks like they will be adding support for VS Code, including for debugging.

"In upcoming .NET 10 previews we’re aiming to improve the experience of working with file-based apps in VS Code, with enhnanced IntelliSense for the new file-based directives, improved performance, and support for debugging."

Still, it isn't like graphically dump a data structure like in LinQPad.

There's very useful stuff there for sure, just gated behind an unfathomably deficient code editor. IMO Albahari should just embed Monaco in it.