I think the issues with Pulisic is partly the over-hyped thing, maybe from a US standpoint. But also, the problem was, he burst onto the scene very positively for Dortmund, at such a young age, and that always makes people sit up and take notice. Unfortunately for him, multiple coaching changes later, his form dipped, as did his apperances, and with it maybe his confidence. Plus a badly timed injury at the start of this season handed the initiative to Sancho and also Bruun-Larsen to an extent. So by the time he was fit again he was well behind in the playing order. And it's looked all the worse for other young players on the same team as him in Dembele and now Sancho, making far bigger impressions and quicker progress, which amplifies his slower progress.
Only time will tell if the early hype and early signs are a true indication of his talent level.