I currently maintain a "legacy" VFP application that is actually quite robust. Not as modern as most languages, but desktop apps can be quite robust. The access to HTTP libraries and WebView controls can bridge some gaps.

What's really missing is a better IDE with better type hinting, autocomplete, tabs, etc... VS Code would be a great base for an updated IDE. I know that Rick Strahl's West Wind has support for Visual Studio, but there's still some functionality missing.