@carlos269
No one in their right mind disputes that sound can be accurately recorded in one's listening room. But even someone such as myself who has no recording experience comprehends that how it is recorded makes a very significant difference.
Someone - maybe it was you - made the argument that a mere smartphone is all that's needed to produce a good-enough quality recording.
My experience was this: with my smartphone, I recorded my system playing a piece I am well familiar with. Then I streamed my phone recording to the system that played it while I recorded it. Therefore, the original FLAC file, and the recording made with my phone were heard on the exact same system within seconds of one another.
The difference was striking. The phone recording had less than half the SPL, no bass, severely rolled off highs, and no soundstage whatsoever. FM radio vs AM radio.
My point is that evaluating system SQ via YouTube videos is inherently fraught, for we don't know how the sound was recorded and, more importantly, processed, in the first place. I have no doubt that a good sound engineer could make a middling system sound better on YouTube than that poor guy's with the model 911 hanging from the wall of his room.