Nemesis Destiny
Adventurer
To be clear, I was comparing it with previous editions where everyone could just do it if they wanted to with some minor penalties. It's hard to get outside of your class in 4e. Not everyone can just do it, like in previous editions. That's a pretty significant barrier.It had an entire class built around it in a game of eight classes. Calling it 'hard to get' is like saying 'sword and board' or 'healing magic' or 'backstabber' are hard to get.
It's not hard-to-get if 1/8 of the game at release was built around it.
At launch that meant Ranger or not at all. 1/8th as you said. Now there are 40 classes. How many have At-will dual-wielding weapon powers? 3? That's less than 1/8. Plus a race at Paragon? One of another 40 options, about 1/3rd of the way through the game.
It may be a great way to optimize in 4e, but there aren't a ton of different ways to do it. Otherwise, you're looking at a +1 damage with a feat.
So it may be easy to do in terms of "yes it can be done, here's how," but it's hard to do in terms of "here's my concept that doesn't include Fighter Ranger or Barbarian, nor the Half-elven rance, and to which I want to add meaningful dual-wielding."