^^ The point being made though, is that in post you should ALWAYS amplify/normalize to 0dB regardless of where your levels were during recording. And, as noted, you should try and isolate out any weirdly loud peak sounds (I usually find it's a snare hit, or on an SBD, sometimes a particularly loud shout or something if that's part of the vocal).
This is exactly what I do.
Sometimes I run hot and don't add anything.
I also find the high peaks from a clap or a sharp snare hit etc, and reduce those significantly.
When normalizing I use peak normalize which takes the guesswork out of amplifying to a certain db.
All peak normalizing does is scan the waveform for the highest peak and amplifies the whole file from that point to the limit I specify, which is usually -.25 db.
That is where reducing those sharp peaks from a clap etc. beforehand works great.
Say the average music peaks around -6db in the set. However, there were a couple huge claps that reach -1db.
Without fixing those I would only be adding .75 to to the set since my limit was -.25db.
Tone down those claps to around -6 and peak normalize will add roughly 5.75db to the set.