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.
I ported a FoxPro app to VFP in 2012. I had worked on the original one in DOS and ported it to FP for Windows around '96-97, so I knew the IDE's pretty well. But by that point I couldn't stand anything but Emacs. So I got xbase-mode (and patched it a bit), and just automated the project build.
There was 100+ screens so I had to do some bulk processing on those SPR's. But I used WebViews for any new stuff, and that was much better (though it was basically IE7).
Yeah I owe Rick Strahl so many beers for his blog.
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.