I don’t see it as abandonment.
A mix is done when I don’t have any more time to put in to it due to a deadline.
A mix is done when I know I can’t possibly improve it.
There comes a time when you listen and you just “feel fine”. Everything sits properly from an critical engineering standpoint and you are only left to judgment calls based on stylistic options which are viewed as personal taste. Those are decided by me and the band/client. Must-haves, yes, Maybe-haves bring budget considerations and overall thoughts of if it is really necessary.
Those above options are weighed by the composition as a whole. If the arrangement or melody is weak, poorly played, etc, that weighs in, but the arrangement and melody is usually optimized in the beginning stages.