The old unix editors have had rename across project, find references, go to definition/implementation for several years at this point via lsps (the same way vscode gets its functionality).

> What about integrated debugging

Those are usually (slightly ecosystem dependent) wrappers around a terminal debugger.

> What about hot reload?

Correct me if I'm wrong, but these are also wrappers around cli functionality (once again, might be ecosystem dependent). And you're probably just saving yourself the trouble of writing/running a script.