I’m currently mixing my band’s new EP. Two songs mixed, two more songs tracked, one’s still in the recording phase. When I reach the final mixing stage the songs go onto Dropbox for the band to listen and evaluate the mixes. This is mostly helpful.
they have good music taste
They see things where I have my blind spots
They know and like the songs, so they’ll probably have some blind spots too.
Every player listens to their instrument first. The guitarist wants the guitar loud and the drummer wants to hear more of the drums. They’re probably not the best candidates for seeing the big picture.