I'm pretty sure he just macros it all back and forth? (he'll have to confirm that)
Like, I have a heavy amount of physical defense in one gear set and a heavy amount of magic defense in another gear set... But I don't wear either for normal tanking, just for when I'll take the damage. For the most part, any HNM where you're taking heavy damage of any type you can react fast enough to get gear on before you take the damage. Only minor exceptions would be things like Hurricane Wing, Breaths, etc, which don't do much damage anyway.
But yeah, people have different views on that.. Some don't like to blink, some don't mind it, some have healers that aren't accustomed to it, and some have healers that are used to it. So that all varies.
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