I regret Delphi is a niche product now as it's quite powerful now, with native apps also for mobile platforms. Pity that the Community Edition doesn't support Linux.
They also seem to support app development for Android: https://wiki.lazarus.freepascal.org/Portal:Android and iOS: https://wiki.lazarus.freepascal.org/Portal:iOS
Some time ago they acquired a cross-platform component library, FireMonkey[2], which does not use native controls.
[1]: https://docs.microsoft.com/en-us/windows/win32/controls/indi...
[2]: http://docwiki.embarcadero.com/RADStudio/Sydney/en/FireMonke...