Interesting how you address yourself as a "Business PhD". I could be wrong but around my place, only non-Finance PhD's in Business would call themselves a "Business PhD". You doing organization behavior or marketing or something like that?
Anyway. Those attributes that you'd listed are so generic that it pretty much describes any "sufficiently well educated young adult". While I hope the MBAs learn something from business school, is it worth the tuition and more importantly, is it necessary walk around with a blatant superiority complex? It seems to me that the MBA is just a really expensive rite of passage.
MBA/Business PhD here
I agree MBA is mostly a signalling and screening mechanism, but not a "bad equilibrium outcome."
If you are hiring someone to manage a consumer brand, you are not looking for a guy with an A in real analysis. You want someone who:
-works well in teams
-communicates well
-understands customer needs
-has enough quant skills to understand and use Excel spreadsheets
An MBA is a good indicator of these qualities.