Does reviewing LBW really require thought from batting side in a test inning?

[Trichromatic]

3 reviews.

 

Chances of 3 LBWs and 3 wrong reviews are almost negligible. 

 

For edges batsman knows whether they have hit it or not.

[Lord]

Remove umpire call

 

Then 3 is okay

[Trichromatic]

Why didn't Bumrah review that LBW?

[Trichromatic]

What were NZ openers discussing?

 

There are 3 reviews in a inning and it's unlikely that there will more than 3 mistakes by batting team in inning to lose out all reviews.