Lets put it into context , are we advocating going back to 90 mins ETOPS on a twin. If its safe enough for 300 pax on ONE engine with 240 mins ETOPS whats the problem with 3 engines within reasonable distance of a suitable diversion if there was another problem ?
BVCU you have made the mistake of trying to argue reason and logic; I hope you have spotted your mistake and will promise not to do it again.
The thing which makes me chuckle is that there are now hundreds of posts about a precautionary shutdown; technically the engine didn't even fail. Many aircraft have run with zippo oil for hours but when you have 4 why take the risk!