Siri continues to be a work-in-progress, and though it is useful, it still has surprising gaps. For example, Siri should know basic information about what you have on your iOS device, if not in 3rd party apps, surely in Apple-supplied ones—especially those apps that function as media libraries.
But ask Siri how many books you have in your iBooks library, and Siri instead offers a suggestion that definitely won’t work.
Or ask Siri to open a folder on one of your home pages, and, although it can open apps just fine, folders are beyond it.
And don’t ask the poor thing to count your songs in the Music app.
I’d love it if Siri could answer questions about the device on which it runs. That can’t be too hard, can it?