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

[Khalithar]

I remember multiple incidences in level 50 content where bards running around like derps

That's a feature of the class 50+ and below.

Though when I did it I found a specific section of the boss arena (depending on the boss) to do it so I wouldn't get in anyone's way. But being a mobile dps is one of the best parts of the class.