Do you trust your ears more than measurements?

My ears

This also assumes we hear the same.  We don't.  When I look at a red car do you see the identical color red?  Probably not. Thus we all adjust to our own unique perceptions and, in turn, make adjustments for this uniqueness in our prefered SQ. For me It's more about just having fun with the gear and enjoying the music than striving for a single "best" result.

Do you test drive a car that you are considering buying, or do you make a buying decision based on the Road and Track test?

Yes. Both.

The R&D test (objectives) narrow down the field. The test drive determines if everything is satisfactory. How does a car enter your sphere of consideration without first knowing its most important objectives? You can't always tell by looking. A Corvette may look fast, but a Civic Type R may smoke it around the track. That's why you need to look at measurements.

"We don’t listen to square waves on purpose, but that is one measurement from the old days that is still a valid predictor of sonic performance."

Ahhh, but we do! Can you show me even one analog synthesizer that doesn’t include a square wave pattern in its oscillators?

My room sounded decent when first built but measured like this:

After treating the room is produces this now. SOund better?