Its well known that Hobbs and Sutcliffe hardly ever faced a real fast bowler. Their test career has them opening more often than not against spinners and people who bowled at Hansie Cronje speed. Sure, they did excellently against them and the few occasional fast bowlers bowling to stumps they faced too. But that doesnt make a genuine case of them opening against 3 bowlers bowling 90mph who are going to try to knock their heads off.
They were great in their era but empirically, fall short of making a case on why they would succeed in this era, except for the 'magic of adaptability' argument to augument their cases.