How about: Using win32 means your application works without any problem and any third-party dlls or weird installs on anything from win2k to windows10 and winRT (any non-arm version). Making a single .exe that works across all of them isn't very hard. Making one that also works on linux and even android and ios is possible, but isn't nearly as seemless. Needless to say, you won't achieve this with either webapps, C#, java, or any of the other languages.

It's incredibly fast. You know how Go and C++ start with tiny applications ? The app starts up 0.2 seconds after you've finished typing the command. Delphi does that for 150000 lines applications. Your executables are decently sized (2-5 megabytes for large apps, kilobytes for small games and the like. Especially Go and C++ have problems with executable size. Go's hello world is still > 2 megabytes, and large go apps have huge binary sizes (dozens of megabytes), despite not containing spectacular amounts of code. Large C++ binaries, statically linked, are dozens to hundreds of megabytes (and God help you if you turn on debug info. I've known compiling a webserver + database app in C++ that actually failed to compile due to the single binary filling up the disk that had ~18 Gigabytes of free space (the binary, once compiled was 1.8 gigabytes, the rest was intermediate files)).

The number of add-ons, controls, database connectivity, install software, ... available for Delphi defies belief and they're extremely high quality.

It's extremely unlikely to change in backwards incompatible ways. Your code will keep working, and will keep looking and working the way it does now (compared to java or shudder the web, it's heaven)

Of course, there are downsides : manual memory allocation is a bit inconvenient (but very fast), HTTP/JSON communication is tricky. Nobody trusts .exe files anymore (for good reason, of course, but ...). It's unlikely to impress when judged on the last buzzwords.