What could delphi possibly every offer that in not in not available in C#??? With C#, at least you have a solid company behind it (Microsoft). Ive seen this so-called Delphi cross platform and it is an utter joke. The dev environment is completely locked to Windows, the apps it generates don't even vaguely resemble a native Mac application. Visual Studio is freaking FREE, yes, FREE, and supported by an actual company like Microsoft.
The company has such a great track record as well, lets see, it was borland, then they had this brilliant idea to throw everything away and wrap everything around QT, then they threw all that away, went bankrupt and became inprise. Then that went bankrupt, assets were bought by code gear, that went bankrupt, assets bought by what embarcadero now. How long until this joke goes bankrupt.
You want cross platform, use something that actually has a standard like C#, C++ or Java.
I guess Delphi is great for maintaining your shareware windows applications you wrote back in 1995.
How about interacting with others, well Delphi is such a joke that it can't even use a C++ library compiled with MSVC, and what 3 people on the planet actually use Delphi, so I guess you could work with them???
Funny how every company I've ever worked for "used to be Borland shop". Think about it.