Why is it.. that we get "Simple Step" at lvl 15. But the ability to have a dance 'partner', is not till lvl 60?

Was it simply not thought about dancers being in pre-level 60 dungeons? Or was it thought that allowing the dancer 'buff' to be on 2 people in those lower dungeons to be over-powered?

Note: This is NOT a rant, or a complaint. Im genuinely curious is all