I've hit number 4 quite a bit. If there's a system that's entirely Erlang/Elixir it tends to work well, and is generally very pleasant to work with. This afaik is the actual usecase? ie not big distributed systems, but small(ish) self contained and self sustaining systems. And then you start layering these systems together with containers and ugh <shudders a bit>
I've certainly found it to be much more specialist than I think many cheerleaders would have it. It can do most things out of the box (and that I guess is the point of OTP), but to make it do those things requires quite a deep understanding of the platform (and that it is a platform, that the language is just a way to interact with that platform). Elixir is my favourite of any language I've worked with, so I'm not down on it, but it's not general purpose
I've certainly found it to be much more specialist than I think many cheerleaders would have it. It can do most things out of the box (and that I guess is the point of OTP), but to make it do those things requires quite a deep understanding of the platform (and that it is a platform, that the language is just a way to interact with that platform). Elixir is my favourite of any language I've worked with, so I'm not down on it, but it's not general purpose