Pogacar likely used Giro as training looking at W/Kg at Giro and Tour, despite breaking the Monte Grappa record.Only 'defense' is probably that he wasn't that great in the Giro and that in these specific races Roglic is taken out by the attrition and weather and Evenepoel is taken out by being fat again.
New era of cycling, just dominating Giro as a warm-up, none of that tiredness or getting into shape.