My guy, that means NOTHING. In 2017, the Flyers had 9 of their draft picks play in the WJC—no other team had more than 6, and most had 2 or 3. Damn, the Flyers must have had a great prospect pool and a bright future, right? Surely, today they're one of the best franchises in the league.
Except those players were David Kase, Felix Sandstrom, David Bernhardt, Carter Hart, Philippe Myers, German Rubtsov, Mikhail Vorobyev, Matej Tomek, and Tanner Laczynski. Not only did they not turn out to be impact players: literally none of them are even in the NHL today. Well, one of them was, but then...
You're hitting on something that has plagued the franchise for a very long time, which is its aversion to boom/bust picks and preference to draft high-floor-low-ceiling talent. Sure, they're shoe-ins for a junior tournament, but that doesn't mean they project to be anything as pros.
Their roster today is 80+% comprised of mid-to-late-first-round draft picks. They might have the most first rounders on the NHL roster of any team in the league, if not the second. Guess what? Those are all just depth guys. Scott Laughtons and Ryan Poehlings. You can't risk a Pastrnak when there's a perfectly good Sanheim sitting right there. Buium? No, Luchankoooooooooo!
They don't have a strong prospect pipeline. At best, they just have more of the same shit they already have in spades. I don't know who you're referring to in college, either.