Never saw half of the potential others did in him - he really didn't have a single above average skill aside from three point shooting. Wasn't that quick or explosive athletically, was too skinny, couldn't pass, not a great ball handler, useless defender, etc. He was a one-hit-wonder basically.
People around here seemed fooled in to thinking he had potential just because he was young (pun not intended) but as I always say...when it comes to potential youth acts as a multiplier to skill/talent, it doesn't outright replace it.
When you have a 19 year old who has the raw physical talent of Jaylen Brown or the natural skill of Jayson Tatum, then age becomes a massive boost to potential. But when you have a 19 year old who is mediocre across the board, age is of little relevance.