Well is there any number to put instead of 1 that is more relevant?
Most people usually get a notification and check it. So there is a 1 there. But its still a nod to notifications. Because that is a big part of what iOS does now and its a selling point.
What else should they have put? A 2? a 5? A realistic 8?
On the other hand I'm sure who ever designed this had to know that it would be mysterious and let it be so on purpose...
I pretty much agree completely. What would we think had they put a number like 2 or 5? Look at all the buzz they have created off the stupid digit 1? It's ridiculous.