I commented elsewhere already, but you do need to know _some_ OTP to be productive. But those basics (processes, messaging, supervision) can be learned easily i

I commented elsewhere already, but you do need to know _some_ OTP to be productive. But those basics (processes, messaging, supervision) can be learned easily in an afternoon. In my opinion, OTP is not the reason why the learning curve is steep. If anything, the learning curve is steep for those trying to switch from something like Ruby to a functional programming language for the first time. A language with immutability as the default, no concept of classes or objects (though viewed through the Alan Kay lens, processes could be seen as "true" objects). If it is your first FP language, most of one's object-oriented experience is not going to help, so there is a lot to absorb before you even get to Phoenix or OTP.