Pulseaudio is a bit strange, but nothing requires it's use, and IMHO there is no real reason for it to be used unless you want to do somewhat strange things (that you generally can't do on any other type of OS).
Like per-application volume control that no other OS provides (except Windows Vista and higher, Mac OSX, etc)?
Thus mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true. -- Bertrand Russell