[yasth]

Eh, I think it is a natural process though in one's professional life. Especially with something like phones where the complexity has just exploded within each platform. The number of ways to deploy code on iOS alone (ObjC, Swift, Cordova, React native, etc.) has increased rapidly, and the size of the system apis alone has increased massively. Some form of specialization is likely inevitable. There was a time when the web only had webmasters, and they did everything from devops to backend to frontend. Gradually it became handy for a lot of people to focus their professional career on one area they were particularly good at, especially to move to the absolute peak of their potential.

By all means people should try out things, and keep up with things, but for a lot of professional reasons it makes sense to have a core competency. Of course it also makes sense to move that as needed.