Yep. Erlang/BEAM PIDs, processes, supervision trees, supervisor strategies, supervisors are underrated. They should be built into the OS. Honestly, every "program" should be a function, return structured data, and callable from anywhere. Logs also should be structured rather than deserialized lines. Lines requires parsing. Parsing is a waste of electricity and time because it discards boundaries between values. The current paradigm is unwise because it's slow and inefficient unless you actually need lines. Rarely do you need just lines. Look at how nasty bash, grep, awk, sed, cut, head, tail, tr scripts will become.

Also, debugging and profiling, I still can't believe many programming environments / IDEs lack the features and debugging integration that ancient Borland Pascal and MSVC had.