Several things. First, I would imagine that despite the fact that you personally would never buy a higher end transparent cabinet, they "major in it" because, apparently, a lot of people want that. Clarity on the stage is important. And, if you're playing through a PA, your cab is not going to be the source of "your sound" for the audience nyway. It's pretty much just for you.
As for whether transparent is good or not for cabs, that's entirely an individual choice and I see, and utilize, both sides. Indeed, depending on the gig, I switch back and forth between Barefaced 10's (colored, vintagey just bit) and 12's (neutral/transparent). Generally I prefer the transparent ones and then add my color, rather than just letting the cab be my color. I want the cab to convey my sound, not be my sound, usually. That said, I also love a tube Super Bassman 300 through some 6x10 Barefaced. Barky as I wanna be.
Also, if you have a barky amp you like, maybe you don't need a barky cab, and a transparent one will convey your barky amp sound. Bark + Bark = a f@*#load of bark. Barkage can also come from your instrument, and a transparent cab will let you hear the carefully cultivated bark from your chosen bass and amp.
Finally, in general, I say live and let live. If you want that Ampeg tone, that's great-- it's a classic tone-- but I can't really fathom the worldview it would require to say that I "couldn't understand" why someone, let alone a lot of people, would make a different choice.