I think the evidence that most (outsiders) see is that "labs.google.com" seems kind of bare. One item that I found useful in there was something that let you type in a few related words / phrases, and it would complete the list for you. Useful for finding other items in a particular category when you knew of a few examples, but didn't know the specific category name (example: what comes after primary, secondary, tertiary). Now it's gone.