That's quite easy to make things that are not fault tolerant and not scalable. - Joe Armstrong

You don't want your fault creep into the system and damage other parts of the system. you need to build firewall between things to stop them from propagating.

If we combine git and bittorrent we got gittorrent.

In Erlang, F(G(X)) is used for small steps. Pipes are used for big steps. The big steps semantics is processes. It's messages between processes. Processes are used for big computation. When you got F(G(X)) is a small step, and we map small steps on the same core. We map big steps on processes. Processes map on multi-core. The system just does it for you.