Can you give an example of what you're referring to? I don't know of anything limiting memory / cpu / etc in Erlang at least of any individual gen_server. We have the Factory processes which can gracefully loadshed, but that doesn't stop you from having a memory leak.

At least Rust doesn't have a garbage collector, so when the actor is stopped + dropped, it'll cleanup not only it's state but also it's message queue's flushing them so that all memory is released at the time of drop.