Although you compare Pogacar to US Postal, a tasteless comparison (Then don't get angry at other, less offensive comments), Pogacar is a rider who handles himself quite well on his own. In 2020, he won the Tour de France single-handedly; his team was terrible. He doesn't have the strongest national team and wins, and the Classics against MVDP in recent years have given him a lot of experience in handling certain situations.
You talk about cooperation as if Vingegaard weren't interested in eliminating Remco. They're not on the same team, and Lipowitz isn't a false contender, as he believed with Roglic in 2022.
Pogacar isn't the same rider either; aside from his physical condition, he's improved a lot with experience.
Pereiro won the Tour due to a disqualification, and Kuss because the three strongest riders were on the same team.
The other ridess you mentioned simply didn't beat someone aiming for a fifth Tour victory.
Vingegaard isn't Remo's ally. Remco's primary goal is to equal Vingegaard; they're rivals in the Tour.