Is there a reason to use C++? Certainly.

Some people might simply prefer using C++ over other options. Asking if there's a reason to use C++ is like asking why we need to have hundreds of flavors of ice cream. Not everyone likes simply sticking with Vanilla.

If developers already are very competent with C++, the question for them may not be 'why use it?', but rather 'why not?'. There seems to be this trendy anti-C++ thing going on in SO right now, but believe it or not, not everyone subscribes to that. Some people may simply like C++ better than the other languages.

Does C++ need to be used for apps? Of course not. But this same exact question can also be asked for any other language. There are very, very few cases where a particular languages needs to be used for an application.