That's OK. It doesn't matter at what abstraction layer the timeout is taken care of as long as it is taken care of. That it's in a library rather than the language core is an irrelevant distinction.
It’s technically the receive primitive doing this using the after clause. The addition of unique references and selective receive then allows “call” style interactions to built (like gen_server).
Likewise, links and monitors are used for lifetime concerns instead of reference counting actors like Pony or using a global tracing collector. This has some advantages and disadvantages but for the most part I personally find it far more practical than other models which are more like the classic actor model.
