while your artists are performing it would be very nice for them to feel that they are doing something really cool and be it that cool thing that they are doing that they can hear and feel rreally well.
after that the editing, mixing and mastering is engineer geek weirdo stuff that only musicians who read too many MIX articles pay any attention to.
there are albums recorded with SM57s and soundcraft consoles that have performances and recording procedures far superior to the record company safe boring lifeless overdubbed and edited/comped eq'd and compressed to death material recorded with the "best "gear", just because the engineer thought he had nothing better to do and didn't listen while tracking and just wanted to fiddle around with the knobs.. not to mention anything the manager or A&R git had to add to the miasma.
If you have good gear and rational tracking techniques you can only hope that some of these good artists will find out where you are and book some time. non troppo.
anyway. if you have to master, it's always good to leave them something to do with all that nice gear they have, since it's part of the process anyway. It's my guess that most mastering guys these days are attenuating treble while they're finding sneaky ways (not always successfully) to get rid of some. these days while walking through the diffusion of music in public spaces the only hting I hear is hihat and vocals and maybe a little guitar. is this "air"?