Here you are comparing a decent bluetooth speaker to a pretty good wireless active speaker to a hifi setup. I think the original comment about audiophiles is them wasting money on upgrading the hifi setup with all kinds of audio cabling, bi-wiring, etc.

That would be similar to upgrading to that one tiny bit sharper lens which otherwise has the same aperture etc.

Yes that's more accurate. And it's about measurability. Even with that tiny bit sharper lens, you can probably point to an actual measurable difference in the photos. Whether that makes them "better" remains subjective.

Audio is a weird world where everyone lives in their own experience and the externally measurable things often don't really translate to the visceral experience. So everyone kinda comes up with their own tribal knowledge that's often more superstition than science, and a lot of people just tend to assume they need "the best" in lossless files and analog whatever and gold-plated this and that.