Confused on infield fly

[bniu]

only two benefits of intentionally letting a fly ball in the IF drop (non IFF situation) with a runner on first are:

1. Runner on 1st is fast while the batter is slow. Let the ball fall to the ground UNTOUCHED, pick it up on the bounce, get the force at 2nd. Of course you risk a bad bounce and then getting no one out...

2. Batter is pissed at the short fly and just standing at home plate muttering to himself, and R1 is holding 2 feet off first, pick it up on the bounce throw to 2nd, and then throw to 1st, double play!