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And yet whenever people try to prove this point I can not only pick out which is the lower quality sample but if it was running on my system I could give you a good estimate of the actual bitrate of the file that you played to me. It's not important to everybody but it is to some and it can just as obvious as the difference between 30fps to 60fps or the difference between a well mastered DVD and a well mastered blu-ray film.
It depends on your setup and also the quality that your used to but to suggest that the difference is negligible is both subjectively and objectively incorrect and it doesn't matter how often people choose to repeat this fallacy, it doesn't become true.
I haven't used Spotify previously but there are streaming services such as TIDAL which stream uncompressed FLAC music files and Spotify advertising their "Extreme Quality" suggests to me that maybe the quality would be extreme but instead it's a less than stellar 320 kbps.
Not everybody wants HD quality music or even CD quality streaming like you get on TIDAL but that doesn't mean it isn't wanted or appreciated by some people.
That's not what blind ABX style testing has shown. It's easy to find numerous test results. At this point, many on the enthusiast forums when I've searched the topic now only argue for lossless as a smart format to future-proof their collections and have peace of mind that they just have the best. The overwhelming majority of enthusiasts in the blind tests admittedly could not consistently give an accurate selection and noted its difficulty.
I don't know why you are talking to me like I never thought about there being different levels of equipment quality. That's obvious, and so are all the blind test results. 128 vs 320? Easy difference. Almost like YouTube vs. iTunes to enthusiasts. But 320 vs lossless? The jig is up. It's about other factors than a truthful interpretation of the sound quality. I found the answers here most informative. Maybe try the ABX tests if you are curious, but you sound quite determined.
DVD vs. Blu-Ray is quite an exaggerated comparison, as almost anyone with an HD TV can spot the difference (that's what TV displays put them side-by-side to show the obvious).