Dare I say your interpretation of the "fewer live mics the better" standpoint is, shall we say... simplistic? Immature? Taken off the deep end? Totally bat****? Seriously, did a DI box kill your grandmother or something?
Of course no one's saying let's strike all the live mics. The fact is, the less live mics there are, the less bleed needs to be accounted and compensated for in the mix. It just makes the job easier. No one's saying remove every single live mic, just the ones that can be removed without sacrificing the quality of the performance, like electric instruments that can be run through a DI - which don't all sound like crap (believe it or not.) And yes, soundmen do complain about overhead mic bleed - I should know, I do it at every live show I mix for. But I would never think of removing them, like your ridiculous hyperbole implies.
And if you knew anything about stage mic'ing, it's not the bass mic that's the item of most concern, it's the cabinet. It's the sound from the cabinet that bleeds into the other microphones, since bass frequencies aren't easily blocked with plexiglass shields and such.
I actually agree with you that the best sound you get is through a mic, and I'm sure 99.999% of soundmen would likewise concur. And I personally would rather mic the bass and guitar cabs to get those sounds in an ideal situation, but sometimes for very chaotic, poorly equipped (or poorly paying) shows on very small stages, going DI just simplifies things.