I think the key insight in Erlang/OTP is that it should be easy to make any part of your application asynchronous and highly concurrent. Not only can you spread

I think the key insight in Erlang/OTP is that it should be easy to make any part of your application asynchronous and highly concurrent. Not only can you spread an application trivially across many servers, but even within a single server boundary you can take a GenServer and make as many copies of it as you want. you can break up any application into a set of processes communicating with each other asynchronously with not very much effort, which can make breaking it up and scaling it onto more servers easier when you eventually need to. OTP makes highly concurrent applications a joy to write.