Mine was no comment on your post. Just riffing the truth off of Drifta's observation.
On topic, I don't care who drop tunes or why. When I teach I encourage kids not to do it. I don't, never will or had to, and I've played plenty of metal and much heavier music. When I take over for a bassist that drop-tuned, I still refuse and if it came down to it I'd walk away from the gig on that point alone. It often confuses the guitarists and they may whine a bit, but so be it.
I won't carry three axes to a gig with different tunings, or have my ears readjusted after working hard for years to instinct where the notes are.
It's amazing how much time is wasted at some rehearsals.
"That take didn't sound right, are you playing the same note as me? I'm playing an A."
"Actual A, or the note that is now where your A would be in standard tuning?"
"Huh?"
"You've tuned down a whole step, so you're playing a G not an A."
"Well, why don't you just play the 5th fret?"
"You want me to play an A?"
"Yeah, that's what I asked you to do."
"Right, so you want me to play an A against your G?"
"Huh? Just play the same note as me."
"OK, done."
"Why is your hand on the 3rd fret? It's confusing and hard to follow along."
"This is your riff, why are you following my hands?"
"Because it's distracting that you're not playing an A, I can see your hand is in the wrong place! Let me TAB it out for you ..."
Add TABZ and the comedy rivals Spinal Tap.