The point is spec sheets can be and often are useful tools for identifying viable candidates that will most likely PERFORM WELL TOGETHER case by case.
What sounds best, especially after a certain point, is purely a matter of opinion.
Of course some specs and opinions are better than others. The game is to try to find the good ones.
So one can choose their poisons I suppose, but it is what it is. Hopefully the specs reflect that to some reliable degree.
FWIW I also hesitate to recommend something I have not heard but I will do it if someone needs an opinion bad enough in lieu of anything better.
For example if a product or company fits teh bill on paper AND has many positive reviews out there or has been around for awhile and is a proven commodity, there is lower risk. I might cite that with the qualification that I have not heard if someone finds that useful.
Again its all in the information available and how well one is able to synthesis it.
Whether anyone listens or not is a matter mostly of trust, which ideally must be earned.
But yeah, in the end nobody ever knows exactly until they hear it. i will never recommend that anything necessarily sounds the best other than IMHO.
ZD, I might trust your recommendations for hifi gear but I"m afraid I will pass for now on the brain surgery although I'm sure anyone would find some room for improvement there if they looked. :^)