Not quite as simple as that.
Last year, Herbert was #6 but I would suggest the #1, Joe Burrow, is better. In 2019, Kyler Murray was the first pick. He's currently the main man at one of the best teams. More valuable than AJ Brown. As for Parsons being ROTY this year, he was in a position to succeed straight away and has been injury free. While Lawrence has been playing for a shitshow in Jacksonville. The Bengals and Cards do not reach the playoffs this year without those No1 picks.
Thing is, the No1 pick will not always be the best player because the worst teams pick first and they are going to pick based on need. This is not always the best player available.
Pick No1 is very important if your front office is good at evaluating talent.