Question, why does Bard and Machinist share the same core mechanic?

[Ashkendor]

I notice in pre-52 dungeons a lot of Bards love to run and jump around while using their abilities think they are really ace, so I'm guessing they are one of the vocal crowds crying about having to stand still for brief periods >.>

Honestly, I remember multiple incidences in level 50 content where bards running around like derps got me killed.

It's kind of nice not having people running around when they don't need to be.