This clarifies a lot, thank you,
Roon software has the core first unfold decoder included, and it works with “render only” devices to full unfold. But Roon is even more expensive and I dislike their approach of licensing to a single core. It is therefore not usable on the road in a mobile situation.
I use Roon now for over a year and I compared sound and it does sound well. But I agree with some people that a basic Tidal stream 24-bit with a good “not unfolding” DAC can sound just as well or better (also depending on taste).
I read a technical test that showed some downsides of MQA and I can imagine the lossy format downsides can degrade the sound quality level to some extend.
MQA: A Review of controversies, concerns, and cautions - Reviews - Audiophile Style
So the advantage that MQA gives: mainly absence of jitter is then partly or totally gone. I tested it myself with a more expensive DAC.
However I am not against MQA as it gives an efficient streaming capability with good sound while from the same library you can use it on almost any mobile gear.