freddy adu followed his dream, played in Europe, got paid and played for usmnt but never lived up to expectations. In other words... a bust. Miazga is in the same path. He will prob be back in mls by his late 20s.
Same thing happen to brek shea, eddie johnson, agudelo, sal zizzo, gyau, kenny cooper... ect
I could go on and on since history repeats itself.
Freddy Adu bounced around the lower european leagues for a few years before coming back to the NASL
Matt Miazga has been on loan at top European leagues, and is currently starting on a Champions League caliber team (as well as the USMNT), while still on the payroll of one of the biggest clubs in the world.
The two are not comparable in the slightest.