Excluding Airuts because they're just insane compared to everything else, t70 is still about 100k exp/hour faster (than t80 armor and t90 weapon at least)
I've just been doing siphons because it's more fun than loafing polypore dungeon or splashing against muspah for X00 hours
Isn't the only reason to disassemble crystal equipment to gain seren components for enlighten 3? Besides crystal staff 'cause it doesn't always give seren components. ;(