You're getting rather confused here.
For starters, nobody has said that "all gear sounds the same". What I have said is that all CD players sound the same, and that cables make no difference to the sound. I also personally think that amplifiers all sound the same, or to be more precise, any differences they may have are so small as to be insignificant.
As for studios, recording is a completely different process to playback. Microphones all sound different as they are mechanical devices. Different EQ units will impart their own sonic signature on things, and so on.
The one area in a home hifi setup that really matters is the speakers. They (and the room you put them in) are what defines what you hear.
Oh hang on. You wrote:
"Everything you've ever written about this sort of stuff revolves around you saying things like "try a Rotel amp, they're more laid back" or "a marantz CD player is usually more forward sounding"
"Until you do a proper blind test you're wasting your time"
Re-read the thread. When I suggested listening to a variety of different systems at different price points some posters opined that the only valid means of assessing the sound of a system would be via ABX testing -you wrote of "proper blind tests".
If you are now accepting that gear doesn't all sound the same (oh no - now all amplifiers sound the same or the differences are so small as to be insignificant) then you will concede that Marantz amplifier
can sound different to a Rotel amplifier and a host of other brands. I explained that using terms such as 'warm', 'open' (etc) is a non-technical means of describing a sound - I pointed out that you would explain such differences of sound in technical terms and I provided some crude examples for comparison.
If the issue isn't the gear then presumably your insistence that such differences can only truly be detected using blind tests is nonsense? Unless of course
you have no faith in your own abilities
not to arrive at an
individual conclusion regarding the sound you
prefer (quite subjectively of course). This explains:
"You pay more, you know what is being tested and when it's being changed, so you think they sound better".
CDs and amplifiers sound the same?
Incidentally, the guy behind the video (Ethan Winer) can be seen writing about the video and responsing to criticisms regarding the partisan nature of the video on the gearslutz.com forums. You are an audio professional so you may already be on the forum, but for others reading this thread it offers an alternative view of the issues he raises.
To conclude, I say to people buying gear that the most important factor to consider is how a system sounds to you. Does it get you closer to the music? Does it make you want to listen again and again to your favourite music format? If yes then great. The gear is a means to an end - and
not the end in itself.