I think covid is the culprit.

You couldn’t physically get on the mix stage and review your show with the mixer because of covid protocols. If you were lucky the director could get on the mix stage during covid. But a lot of the studios forbade it. So you had directors, producers, and showrunners giving audio notes remotely.

Which was a disaster because there was no uniform way for all the people giving notes to monitor the audio.

Color was already dialed in for remote work ahead of covid. A lot of color houses send any remote participants an iPad Pro. There’s not a lot of color setting to tweak on an iPad Pro so it was easier for the color houses to know everyone was viewing the content in the same color space.

Also, a good number of sound mixers are still working from home. Everyone’s home office is a different shape. And has different acoustic properties. There’s no way to pink out all the different rooms to make sure everyone is calibrated the same way.

EDIT: Sound also isn’t given enough respect on set. It’s always image over audio. If the boom mic gets in the way, its gone for that set up. And production schedules are so tight now that crew will be off building or striking another set while action is being recorded nearby. So you constantly have people shouting for work to be stopped because all that work is getting picked up by the audio devices.