The abstractions I’m talking about are the Erlang VMs and the primitives like actors that are provided by the OTP. I have cold sweats thinking about needing to debug a non-obvious performance issue and diving into that layer.
Ok. Well there are a lot of other options for performance and no matter what system you're in (python, ruby, rust, jvm, c++) those kind of performance debugging is going to be a slog, and GenServers are relatively easy to work with and the VM gives you a lot of tools to figure it out. Most people at scale seem to be doing okay with elixir.
I will say the one thing that I do see coming up over and over again is OOM errors, but I personally feel that's because there are a few gotchas that juniors don't always know about
