is this because siri can't understand u fully every time ?
Its better than yelling at your mate...
Siri can't argue with you

GPS does this ,,, the re-routung is good, but when i KNOW where i am enough to get back i still don't need some annoying little terd in the background saying "Your destination is on the right"....
ya i know where i live...it's my house after all ... Usually i just ignore the rest...
I figure if u can just block out what u *don't* want to hear anyway, then it doesn't really matter which is more accurate... however if u rely on it, then ya its just damn irritating at times.