I'd buy the argument if we were adjusting a run or three but...
... Is it really harder than an uncovered pitch in the 60s, or a hooping 70s ball? Are Cummins and Hazelwood really better than Marshall and Ambrose, Roberts and Holding, Wasim and Waqar, Donald, De Villiers and Pollock, McGrath and Gillespie and so on?
I watched a fair amount of cricket over that period (apart from Roberts) and there is no competition. The likes of Gooch and Atherton didn't repeatedly nick off on sixth stump or get done through the gate. To quote a couple of names off the top of my head, I reckon we'd kill to have Marty. Moxon and Wayne Larkins now. Or Bill Athey, Rob Key, Tim Robinson...