How can you hope to persuade me of any particular claim to audiophilic excellence
IMO, rather than be persuaded, people should review both subjective opinions as well as objective measurements and specifications, compare those with their own experiences, and then come to their own conclusions.
However, any information on these forums could (should?) be viewed with healthy skepticism. Measurements can be both scientifically correct but also misleading in that the parameters being measured may or may not have the degree of impact on how something sounds as you might be "persuaded" to believe.
Likewise, subjective opinions rely on the experience and bias of the person providing the opinion. For example, how much reliance do you have in posters who report that the sound of their systems are "totally transformed" just about every time they install a new cable, fuse, or other tweek? Is that even possible, or are they just prone to exaggeration? When the same tweek fails to have a similar effect on the sound of your own system, common themes here are that your system is not resolving enough, or you didn’t let it burn in long enough, or maybe you just don’t hear well. I find it helpful when I am able to view the poster’s virtual system as their equipment choices provide some context or basis for their opinions, as do their previous posting history.
How about manufacturers who blur the lines between objective scientific facts and subjective hyperbole. As an example:
About the size of a shirt button, yet powerful enough to transform the way you experience music...your speakers and room disappear leaving you with nothing but a live holographic musical event in your listening room...
...oscillate at high frequencies creating an energy field in your room that overpowers room vibrational distortions to correct phase and frequency interactions for harmonic balance in your treated room. You hear an increase in depth and width, with clearer more extended highs, and tighter bass. Everything sounds more live, clearer, and more natural than you could ever imagine.
All of the above is claimed to result from placing 5 very small cylinders or discs ("the size of a shirt button") on the walls of the listening room and/or on the speakers - I find this an amazing blend of scientific claims and subjective rhetoric.