MQA actually tested

Wow, if this is true, and at this point it feels like it is, a lot of high-end manufacturers have some ‘splaining to do as to why they incorporated this and charge their customers for it. And I agree with the earlier comment this certainly seems to at the very least embarrass those audiophiles who suggest that their ears are the ultimate test instrument and who a year or so ago could do nothing but gush about how good MQA sounds.

For the "beginner"?  Approach with caution.  It is tough in the day and age of COVID if you are in a location where you might not be able to listen to equipment or specific music before laying your money down.  Measurements do matter when they translate to clear distinctions in music quality...that's where it all goes sideways--people swear to clear distinctions for all kinds of stuff.  So basically, don't buy into the hype...listen and buy what you like.  If you hear something you like better, sell what you have an buy the new thing if it is worth the difference.  In the case of the vid I referenced in the start of this thread, the measurements were more of a verification of what I was hearing when comparing FLAC vs MQA.

I'm still looking for a good high-end Elcasette...

So we’re better off setting the sound quality to “HiFi” instead of “Master” within the Tidal app?

I don't think it's as black and white as everyone wants it to be. MQA is not lossless and the filtering adds distortion, I don't think anyone other than MQA would argue with that. That doesn't mean someone won't like the way it sounds.  The part that bothers me most with MQA is the marketing statements that don't align with reality and how they go out of the way to make it hard to test any marketing claims that are made. If MQA did what it said I don't see what harm there is in letting 3rd party testers validate that.

In regards to why companies are adding MQA support to devices I think Paul McGowan from PS Audio hit the nail on the head. Customers are asking for it. It's a business move. 

Like most things in this hobby, listen for yourself and decide what you like. I have a non MQA DAC and find that letting my Aurender do the first unfold on MQA tracks tends to sound pretty good to me. So that's how I listen to Tidal. Comparing that first unfold on Tidal to anything Hi-Res on Qobuz I find I tend to like the Qobuz offering better. So when available I always listen to the Qobuz Hi-Res version.