I wonder why so many have got this wrong across this thread? Was it true once upon a time or something, or have people just misunderstood your docs or similar?

OTP is a very complex subject and quite unusual in its scope, and it’s not even overly clear what it even is. Even in Erlang and Elixir it’s commonly confused, so I think it’s understandable that Gleam has the same problem further still with its more distinct programming style.