Maybe I can shed light on the language choice: it's partly the language itself, partly the editor.
Delphi was rises out of Pascal a similar way as C++ out of C - but a decade later, when Pascal was already old-fashioned. And only short time later Java emerged, which was taught in many universities. So the Pascal/Delphi-community was rather small. Therefore, compared to C++ only a small amount of libraries was released to work with. Which meant, that only a little amount of programers was attracted by Delphi etc.
Is Delphi even an ISO standard? Is it a property of Borland? How many compilers are out there?
And don't underestimate the amount of people what just heard, that C++ is often used for large projects and then ask.
But in my opinion, the more important reason is the lack of a good editor. I have tried Lazarus and it failed miserably to suit my taste. Borland Delphi costs money.
On the other side, the Microsoft Visual Studios are a programing suite that cannot be rated high enough. It is freely available for students, the Express Versions even for the public. For the Linux community, I don't have to mention the gcc, do I?
It is free, known and very good - so don't expect appreciation for a solution that is expensive, unfree, uncommon and bad