Comment by benmmurphy

You still have to be careful with supervision trees and parts of the tree restarting. For example your system might work if the whole erlang operating system process is suddenly killed and restarted but your system might start corrupting data if parts of the erlang process tree is restarted. Erlang gives you a good model to work with these problems but it doesn't allow you to completely turn off your brain. If you walk in thinking that you can just let things restart and everything will be fine then you might end up getting burnt.