"Real quality" is also an opinion. It's obviously not "pure" distortion either, or else it would just sound like noise. By that argument you could also say that any DSP is distortion.
True. However, I'm less concerned about what is technically true lossless than I am about how it sounds. If I was given a choice between 24/192 lossless PCM and 24/192 MQA of the same master then I may opt for the lossless, but unfortunately that's not a choice that is often available. However, I haven't done enough subjective testing between those two options yet to determine which sounds better.And lossless IS trully lossless (1:1 from original), compressed or not.
Not really. MQA is not lossy in the same way that MP3 is lossy, and it contains corrections in the analog domain.mqa is just what mp3pro intented to be years ago.