I don't think most 3-star guys get 19 offers. Also, as others have pointed out, there are 4 and 5-star guys that are overranked. I just think the ranking system is foul (my opinion). As I said in a response in this thread, the media has made recruiting such a big deal that teams gain and lose momentum based on perception of the rankings of their recruits. Perception become becomes reality. Miami has more 3-star commits than 4-star commits this cycle this far. If Miami wound up with 18 3-stars and 7 4-stars, the perception would be Miami had a weak class. They lost Momentum. They're moving back towards irrelevance.
If Miami had Wisconsin's recruiting ranking (2019-20th, 2018-44th, 2017-39th) every year, most would consider Miami a recruiting failure.