It’s not that niche at all if you have a cross platform app or you have a big part of your app that has to interface with metal kernel code, which is C++. There

It’s not that niche at all if you have a cross platform app or you have a big part of your app that has to interface with metal kernel code, which is C++. There are a lot of reasons why you would want that code accessible from swift as well. And it’s also a big deal in games, communicating between swift and C++ is necessary unless your game only exists on iOS.