Nearly all manufacturers do not advertise/exhibit their product measurements? Why?

@carlsbad Yes, I was banned in less than 2 hours.  You can read about it on the Audio Science Review review on Audiogon.

@mitch2 The real problem are cables and tweaks.  Where are the electric and/or acoustic specifications (let alone measurements).   So much puffery and exaggerated promotion without a hint of specs or measurements, in general.

As to equipment, your examples of specs not conforming or relevant as measurements is also common.   So often power output at reduced impedances are lower and occasionally at 8 ohms lower than actual.  Impendence mismatches can be a problem.  I purchased Legacy Signature IIIs from a guy with a Boulder amp and some boutique tube (unknown) preamp.  They sounded quite awful which the seller admitted as the reason he was selling them.  I brought a Sherwood 7100 16 watt 1970s receiver.  It blew the seller away.   Great mid-fi sound, including decent bass.  He had already ordered other speakers so he let me buy the Sigs.  Legacy speakers post high efficiency but they have low impedances with occasional sharp phase angles.  While many decent 35 watt receivers can power them with good current/power supplies, other amps one would assume could power them (especially the bass) with 70 watts can't.  

I still think most manufacturers could do better.  Even the speaker company I want to buy my future speakers from has very limited specs (Von Schweikert).  

Cause it’s about the music man! Not the measurements. 

This reminds me of the Carver Corp. claim in the 80’s that their amps could replicate the sound of any other amp design by adjusting the “transfer function” which was Bob’s buzz word for frequency response plus noise/ distortion profile.  Unless I’m mistaken these amps are not regarded as belonging in audio Valhalla.  The idea that ASR can characterize how an amp will perform with speakers using their methodology is just as suspect today as when Julian Hirsch did it for Stereo Review.  But it is also hard to make the case that an amp that demonstrably alters the signal by its performance can somehow be more high fidelity than one that “measures well”. 
And who would believe manufacturer’s specs anyway?  Independent reviewers are needed for credibility. As long as their credibility is trusted. I trust John Atkinson in Stereophile more than Amir or the shills at Ab Sound.

I bought a nice bottle of cabernet sauvignon and poured a glass for me and my friend.  I took a sip and declared the wine delicious. My friend took a sip and immediately spit it out and said it tasted like $#*t!

But both glasses of wine yielded the same measurements when run through a spectrophotometer. Go figure!

We all hear things differently and prefer certain types of sound.  Can't measure that.

OMG, stop with the circular logic.  A is wrong but B is right, oh wait, no C, no I meant A.