None of you pay much attention to the Eye-talians eh? They ken how to do it best. When I make spag bol it's much simpler than all of that. Decent mince, garlic, oregano, basil, bay leaves, passata, tomato puree, salt, pepper and maybe a beef stock cube. That's it. I love bacon, don't get me wrong, but if you're adding bacon and other stuff it'll eventually cease to be spag bol. Folk that pile in celery and carrots etc and what have you aren't making proper authentic spag bol.
Carbonara is another dish commonly bastardised beyond recognition. 4 or 5 ingredients tops should be all you need for the whole dish.