With the removal of the CDs on the tailoring cloth you can now, essentially, permanently benefit from the 30min buffs (+20 Crit, Haste, and H/MP5) that making the cloths grants you. The buffs don't persist through death, but they do last 30 minutes. So if you're looking to min/max your character for raiding then keep some mats on you to make these cloths which are relatively cheap IMO.
I don't know if blizzard was aware of it, but make use of it while you can before they decide to change or take away the buffs.