If the purpose of replay is to get it right it has to be overturned.
Yup. This.
There are some plays, like the ball trapped against the screen into the catcher's mitt, which are given an almost absurd amount of scrutiny.
Then plays which actually can be determined, definitively, aren't given the same treatment and ultimately tossed into the "not clear evidence" heap.
There's no consistency and it's really frustrating to watch.