Without a doubt watching a recruit play at the highest level most likely will be the indicator for an offer. I don't think anyone is disputing that. But to imply that college coaches do not come to watch HS games isn't correct.
Especially from hot bed states where a large portion of their players come from there.
BTW Vanderbilt had 12 players from TN. That's 1/3 of the roster and I am sure that one of those coaches watched a HS game within state.
Of course if you attend a PG tourney and you are a ranked player or have contact with an out of state coach, they will be out there watching.
The whole idea is to never assume that you will be discovered by a coach by just playing HS ball. But don't not assume a local coach will never show up to watch you play.
JMO