Induráin did similar. That opening TT and then a three week holiday in yellow still raises a smile.
I suppose that's the thing. Firstly, Indurain's best result in a classic was 4th in LBL the year he won the Tour, after which he never bothered. He also didn't win a single week long stage race until his 95 and 96 wins at the Dauphine. Pogacar is winning both classics and stage races all year, as is Remco. They're also winning climbs and TTs in GTs quite comfortably, whereas bar the likes of La Plagne, Indurain never rode away from climbers, and was notoriously given a working over in the mountains by Pantani. No one has worked over Pogacar except the entire JV team last year.
The nearest comparison is Hinault, and if you take a random year of his dominance, 1982, he was 8th in the Criterium International, 15th in Fleche Wallonne, 9th in Roubaix, and 4th in Romandie before he won the Giro and Tour In 1985 when he also did the double, he was 23rd at Fleche, 18th at LBL, and 16th at Romandie. You sense with Pog that he'd have either won or podiumed at all of those and still done the double.
At the moment the likes of Ineos, for all their budget, are scrabbling around trying to pick up results where Pog, WvA, MvdP, Remco, and Vingegaard aren't racing (possibly even Roglic). Those 5(6) hoover up pretty much every race they enter. It's pretty insane.