Well, in "rainbow teams," which I say with quotes because they like to hug one color. Orbchangers aren't really used for consistency as much as burst,. So as something meant to maximize damage, I don't see it as weird at all.
It makes sense with her 'hey we have a row!'.
It's actually really bad because generally it doesn't give her much flexibility or fit in with how people actually use her. Also because it can't fucking work in the actual game due to subs and the like. It does give her a slot as a sub however, which is useful.
But for her as a leader it's actually really stifling most of the time, because in a lot of cases with rainbow teams it's beneficial to not be locked into the state you described.
Oh there's also the fact changing your board to just barely fit your needs to activate the leaderskill can backfire terribly if you don't have the two colors you don't change on the board already (and can't mess with the board further with because whoops you just change the only orbs you can change otherwise away).
It'll be even more hillarious if she were to get Goku's much better LS, because then you'd be sacrificing the dream 4.5x activation away!
(tldr, it makes 'sense', but is actually clunky and bad of an active)
Edit: oh and as a sub.... not many leaders actually use hearts other than her. -Whoops-.)