I can understand the need to conserve energy and pace ourselves for the whole season, so as not to burn out (physically ala Liverpool or mentally ala Arsenal).
But surely, the best way to do so is to control the game, as LVG would say (or strangle the game as I prefer to describe his tactics), by applying possession football when we are 2-0 up, to make the opposition have to chase the ball and tire themselves out. All retreating to the penalty area does is to cede the advantage to the opposition and give them confidence and impetus at a time they should have been killed off. This tactic would work if we were great at counter attacking and we scored goals by drawing them out and then hitting them on the break, but we weren't doing so in the last few years of SAF's reign, let alone since then. All we end up doing is agriculturally hoofing the ball upfield and letting the opposition keep on attacking us. All it needs is a deflected shot and even a keeper as good as De Gea is beaten. I cannot see how this can be a good tactic, as it certainly puts excessive pressure on our defence, especially when it goes on for the last 30 minutes or so, not just 5 or 10 minutes. I always thought that attack was the best form of defence ...........