idk. I tend to concur with the OP on poor, "pro level" mixes.
As a freelancer at FOH (not a pro - I don't make my living from it - but I DO get paid!) having run all kinds of analog and smaller digital (but not the big pro rigs), the basics of mixing haven't changed - but the tech and price points have!
The problem I see is over use! Just because your Touchmix 30 has compression, gates, EFX (and other "Stuff") on each channel, doesn't mean you HAVE to use it.
I've subbed at churches where they have EVERYTHING in use.. eg: an X32 with compression on everything (even vox), gates, tons of effects (reverb, delay, chorus) and EQ profiles that look like a six flags roller coaster!
Then there's the "dance club" mentality where the kick/bass are prominent and driving in everything!. Great in the right place, but not everywhere.
When I mix a covers/tribute, I try to make them blend like the original, regardless of genre.
If I don't know the material or it's an originals band whose material I am not familiar with, I'll try to map the mix to the appropriate genre.
When I mix at local churches, I make sure I prep for the gig, and know what the expectations are.
But, there nothing quite like walking into the Sat am church rehearsal to find out you've got 42 inputs - from hand bells and large choir (with overheads) to full electric band (drums, bass, acoustic/electric), acoustic timpani, rain stick, bells, horn (5) and string (8) sections, 5 vocalists, a lectern mic (used by 6 different people) and the principal pastor's wireless headset mic (who expects FOH to watch for muting and un-mute his mic during the service)!!

Can't say I always make it great, but I haven't been fired yet!