Main thing that's useful is that if it can pull in all the elements (def portal, specs, etc.) you get deeplinks to everything. Google also doesn't help finding some APIs easily since it just treats it as content or they aren't linked.

In the long run hopefully a lot of the fields in the apis.json files this pulls on will be machine readable (e.g. meta-data for things like major T&C provisions), pointers to libraries etc. so you could filter on that.