The people who tend to care about high performance on a specific platform are game developers, and we all know Macs don't have that market. And with deprecating OpenGL, they probably aren't going to be getting it either. People on web are always saying performance of language doesn't matter, but then when these ultra-specific libraries come up it becomes different--- but I'd say server performance is _way_ more important than how fast my Notepad app runs...
Well, also web browser developers, authors of A/V software, etc.
Do you want Safari to be the only web browser on macOS, Quicktime to be the only video player, etc? Not saying that it will happen, but with the disappearance of OpenGL and if sockets eventually disappear, too, it will become more difficult for independent web browsers (e.g. Firefox, Servo), independent video players (e.g. VLC, MPlayer), etc. to create or maintain a macOS version.
While there’s truth to this, there’s no real discussion here about deprecating or removing BSD sockets. UNIX, POSIX and OpenGL are very, very different things to discuss, and Apple deprecating one doesn’t speak to any real expectation of deprecating anything else.
At some point it may happen, but there’s simply no writing on the wall for it right now.
