When peak level is reached, everyone wins!
Back to the topic.. IMO, if you have good meters that are accurate.. you can push it close to 0 when recording a PA since there aren’t usually big changes in dynamics.
If meters are limited or not accurate, I aim for -6.
If I can’t keep checking the meters, I aim for -12.
If there are huge swings in the dynamics of the performance, I aim for -12 or even lower based on the situation. Think crazy jazz dynamics coming straight off the stage.. they can be all over the place.
But I do agree that -12 is safe and just boost in post.
But I also prefer the sound of my rig running closer to 0.
In the end, it’s all good.. but I like it hot!!
YMMV.
Edit to add: I run 24 bit and still prefer to run hot when possible.