At least 4 teams from EVERY bracket are playing four games in four days. That's a lot of players. Then you have two teams from EVERY bracket playing 2x on the same day (after three previous games). These are not 8yr olds. Talk to every 14-18yr old after three games and I guarantee you they are playing hurt or exhausted. If not, then they don't play hard.
Every team has players that play more than 50% in every game. If you don't know that, then you haven't been watching much U14-u19 soccer.
Given pressures from coaches and other parents, there's no way a kid is going to say "sit me because I need more rest/recovery time" during a college recruiting event. This statement from you makes me think you have no experience yet in these upper age groups.
What's the GOOD reason for playing a 4th game in 4 days? Colleges don't, youth national teams don't, professionals don't. Most of the scouts are gone, the players are exhausted, the soccer is bad, and the injury risk is at its PEAK. There is NO benefit to the player.