Point taken, but the language is not the thing I would hire for anyway. It's the environment and skill-set beyond the language. A mobile developer even requires

Point taken, but the language is not the thing I would hire for anyway. It's the environment and skill-set beyond the language. A mobile developer even requires a completely different set of instincts to be successful than an engineer who's got work experience building scalable backend systems. C++ running across 1000 inter-connected systems is not the same C++ compiled down to run on a gaming console with limited CPU cycles to spare. C++ shared across iOS and Android is also different because Android requires that you bridge the library across Java and iOS may require an Obj-C layer if you're in Swift. If you spent your whole career writing code in Python and you wanted your next job on iOS, my concern wouldn't be, can you learn Swift in a short time. My concern would start at something as simple as how you would cache data when the network connection times out. Or can you manage your data models in a way that can maintain 60fps scrolling, something iOS engineers pride themselves in achieving. Of course all of this can be learned, but my point is that it's more than the language.