I think one's definition of accomplished would possibly clarify the question a little better.
Accomplished: proficient as the result of practice or training. also : skillfully done or produced. established beyond doubt or dispute. These are terms or definitions of "accomplished".
Are we talking Wins? Yards? Touchdowns? League Titles? Championships? Off season success? Camps, 7v7? Elite 11? Off field success? Classroom success? Scholarships? Community? Leadership? If you were to take all of these in to consideration I believe there to be others in the conversation.
There is no doubt Bryce Young plays for the undisputed best team in high school football. Mater Dei. So does that alone make him the most "accomplished? So to say there is simply "nobody" as accomplished is a stretch. The questions Omar B. posed above are the same questions I would ask.
Here are some of the most "accomplished QB's in AMERICA. The Elite 11. After 10 games played, the guy standing at the top in yardage and touchdowns is Ethan Garbers of Corona del Mar. He also leads Orange County in the same stats. So if you are to discount every player whom doesn't play on a national championship team or even a D1 California state team then you are short sided. Because what some of you have pointed out, there is no formula at the top (NFL) on whom is best based on the criteria some of you put forth in claiming nobody else should even be in the conversation.
Like the debate in most sport when it comes to MVP or versus whom is "Best" there is different interpretations, most valuable or best. There is the same within the context of "accomplished.