The Modern DAC killed High Resolution Music - has Stereophile proven it?

Hi Everyone,
One thing I've mentioned a lot is that over the past 10 years or so DAC's really closed the delta in how well they play CD (i.e. Redbook) vs. high resolution (96/24 or higher). I've stated for a long time that the delta closed so much that high resolution music no longer seemed to be as important.

Stereophile just released an interesting set of measurements regarding jitter performance of older players vs. today. It's not absolute proof of my thesis, but it certainly is correlated.

One thing, as I commented, you don't have to compare old DACs to the $15,000 Bartok. The Mytek Brooklyn and others in the $2,000 price range also demonstrate this, and in fact has a very similar jitter rejection profile to the Bartok. The point to me is, almost all decent DAC's have jumped leaps and bounds in jitter performance. That's for sure.  Perhaps this explains the disappearing gap in performance as well between Redbook and Hi Rez? 

Three things come to mind...  First, many DACs do upscaling/upsampling internally...  Second, often the provenance of a music file is unknown...  Is it just upsampled Redbook or a Studio Master that was really recorded at a higher resolution... Lastly, MQA and DSD are broken...  Therefore, it is often obscured as to what you are really listening to...  Apples are not equal to bananas...
How do you know the DACs you’ve heard just aren’t very good at high resolution?

That would be a lot of DACs. .

Might be a time to check down stream. Preamp, amp, speakers, or most probably, your ears. 
Agree with Mayor Adam here.  I currently own a Bryston DAC3 and formerly owned a Mytek Manhattan.  Yes, both DACs got more out of Redbook CD than I had ever thought possible, but Redbook still can’t compare with a really good high resolution downloads and with DSD.  
But why do we assume this has to do with the resolution of the files instead of the performance of the DAC?
I'm not sure I get your reasoning here. R U suggesting that a DAC is selective (so to speak) in what it will play well?
Generally, the higher resolution file "sounds" better than a lower resolution file because contains more info about the same thing—no?
And we appreciate the presence of more musical info in that our brain doesn't need to compensate for what is not there & correct for the rest...