If Johannes Høsflot Klæbo had taken up track instead of xc skiing, he would be the current world champion in the 1500m. With the possibility of getting the world record in the next 2 to 3 years.
Watching him literally run up a steep hill on xc skis in the final of a sprint event (the 4th race of a typical sprint day) is amazing. Both classic and freestyle. The strength, speed, endurance, lactate threshold, and recovery needed to do something like that are far beyond the abilities of any currently competing elite runner.
He's better off in xc skiing. He'll make more money there, and also have many more opportunities to compete. A typical track season of 10 races for a pro (less if you're in a certain american group) hardly seems like an actual season, let alone sporting career.