Surely that style of play would require a team to actually be competant at the breakdown and England are probably the worst tier 1 team in the world at the breakdown. Maybe in a year when he's had a chance to properly coach the team but right now England too easily get turned over to build a game around controlling the breakdown. However it would explain having Haskell in the squad. If mobility isn't want you need and instead just want a big block to put in place, he can probably do that job.
Also with our wingers and 13's available, all with lots of speed, it would be mad to limit our game where that advantage is negated. It's the English back 3 and 13 that have been the stars recently, not our forwards.