[johncolanduoni]

Not using native Win32 HWND based controls does not imply UWP. Virtually every program that was made for Windows XP and later does not use native Win32 controls; this includes “outdated” frameworks like WinForms.

X11 and Win32 UI are actually fairly similar in this respect.

[magicalhippo]

Actually the VCL[1], shipped with Delphi, does to a large extent use the native Win32 controls. They've added some quality of life stuff on top of them, but the TEdit component[2] is a wrapper around the Win32 edit control etc.

Delphi is not so popular these days, but there still is a fair share of Delphi programs running.

[1]: https://en.wikipedia.org/wiki/Visual_Component_Library

[2]: http://docwiki.embarcadero.com/Libraries/Seattle/en/Vcl.StdC...