This is what its scary about Van der Poel. He is currently the most successful one-day rider in the peloton but he could have a much better palmares at the same age.
If he had started road cycling seriously a few years earlier, he would likely have already four Ronde wins and one more at Roubaix and/or Sanremo. Then, in the World Championsips, his hunger knock in Yorkshire 2019 (probably wouldn't have happened with a little more experience), the back injury derrailing the preparation for Leuven and also Roubaix 2021 and the freakish incident in Wollongong 2022, under different circumstances he would be at least a double World Champion by now.