Which is dumb. The "evil queen" is a terrible stereotype. One who makes all the decisions and has a ton of responsibility isn't inherently evil. There's nothing wrong with aspiring to be a ruler at the top either. It seems kinda be.... I don't know... a disservice to females to imply that being a top leader is bad and that it's better to aspire to be below other figureheads and let them lead while you have less responsibilities.
It wasn't Faust's decision, in the end. It was a marketing decision by Hasbro. Frankly, the logic is sound - Disney is the gold standard for selling merch to young girls, and their top franchise for that is "Disney Princesses", after all. Which makes Elsa all the more remarkable, actually, she's probably the first non-villainous queen to appear in a Disney Animation Studios film, let alone one as an actual protagonist that will be elevated into the aforementioned franchise soon enough.
In any event, just having mostly benevolent female rulers that sometimes actually do things (when not farming it off to Twilight Sparkle and Co.), and -are- depicted as the highest leaders, does more good on that front than trying to ban bossy.
I suppose that's neither here nor there, however. I just wanted to know whether or not MLP also had only implied/non present queens/kings and just a princess ruling. The philosophical discussion of whether this should be changed is better suited for another thread.
I once read a comic - I don't have a link, but I think it was Twilight explaining Equestrian history to her daughter - that used the idea that in the Unicorn Kingdom that preceded Equestria (as seen in Hearth's Warming Eve) the title of King or Queen was a mostly ceremonial one that one was elevated to in their old age, while the Princesses and Princes did the real work of running the country, which later led to Equestria's tradition (since Celestia and Luna seem to have come in later).
This actually isn't totally unprecedented, albeit in reverse - at least in the early Shogunate, the current Shogun often retired to allow his heir to take the title, while continuing to rule behind the scenes. I specifically remember this happening with Toku (the Tokugawa, Ieyasu) and his son Hidetada, but the tradition apparently preceded him.