I make no apologies for being sceptical about ETOPS, which has always struck me as an accountant's idea, and in that spirit I wonder how things might have worked out had this particular incident occurred on an ETOPS B777 at a point 180 minutes from the nearest diversion field, calculated for single-engine operation but otherwise clean.
Was the post-incident performance worse than that used for ETOPS planning? Did this failure compromise any ETOPS significant systems? I don't know, just asking.