The trouble with that is the foul may only be truly visible from one specific angle and there's no way to guarantee that you're going to get that particular angle from the first two you look at. An example of this would be the Esse Baharmast penalty decision in the 1998 World Cup. Several video replays televised at the time showed no foul, but another replay from a different angle emerged later, showing a clear pull on Tore Andre Flo's shirt. At the time, Baharmast was on the end of much criticism, including in the post-match TV analyses, with some media outlets accusing him of giving an 'imaginary penalty' despite the fact that he had made what was eventually shown to be the right call.
Imagine that a) this had been a game played with VAR in place, b) the referee had not been in the optimum position to see the foul and c) using VAR he had looked at only the first two replays which showed no foul. He would then not have given the penalty which would have changed the course of the game and the tournament, whereas one of the other subsequent replays would have revealed the clear and obvious shirt pull that had actually occurred.
Esse Baharmast 1998 penalty decision
The linked article talks about 16 cameras not seeing the foul. I'm not sure that's quite true as the embedded YouTube video has an angle that clearly shows it - but certainly none of the replays televised at the time or even immediately after the game, revealed the incident and the angle that did show it didn't emerge till later.