I've been doing Elixir professionally for 6 years. There's a whole class of problems that are best solved with concurrent read/write access to data. So the answ

I've been doing Elixir professionally for 6 years. There's a whole class of problems that are best solved with concurrent read/write access to data. So the answer to your question is exactly that: when you want N-cores to work on the same piece of data.