From very beginning of my presence on SE sites I did not and still do not understand, why "Area 51" is named "Area 51". What's the purpose? What's the inner meaning?
I'd say that SE prefers to name every site in clear and appropriate way. Yet "Area 51" is an exception. Does this negatively affect perception and popularity of the site?
The most natural and self explanatory name would be "Incubator", imho.