Getting an Emp is tons easier than a WoE for someone with a mule, with a high level of game skill, or with friends who are solid at the game and can keep a schedule.

Getting a WoE is possible, over time, for anyone. That's why it is absolutely a reasonable requirement. If a RDM isn't using Chant du Cygne, what the hell are they melee'ing with anyways? Death Blossom (which can arguably take longer to get if you don't have Nyzul complete)? Fast Blade? They're definitely not getting Vorpal Blade with a mage or Nin sub, and Rdm/War is total crap.

Edit: Dare I even suggest Sanguine Blade? =/ I don't even want to think about that.