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mono-stereo I ask the mastering engineer to tell me whats he thinks needs correcting before they do their job. You hope you are getting better when there are less and less requested amends.
The your confident you can ask for a specific character for the master. There’s a little blurb on it here
https://begin.lhaudio.com/mastering
You do sometimes hear elements which you didn’t actively hear post master which you then want to either remove or drop in the mix.
Probably the most positive difference, for my ear, is a widening of the stereo spread.