This skill is for Alexa developers that can't remember all of the amazing built-in slot values that Amazon offers. Ask for the type of data you're looking for, and we will tell you which built-in slot to use!
We will also tell you if a slot doesn't exist, and that you should consider a custom slot in your skill instead.
I'm very much onboard with the idea of meta-skills. That said, what's good for the goose is good for the gander, so I hope this is Amazon signalling that they are going to loosen up their rules on this point. There have been some high-profile cert rejections along these lines in the past.