I have a feeling that Google is not very eager on having 3rd party applications running on their "free" (ad supported) platform. One reason could be that while

I have a feeling that Google is not very eager on having 3rd party applications running on their "free" (ad supported) platform. One reason could be that while these are useful for customers, they are not really bringing in any money for Google. Obviously good 3rd party apps would certainly help people to stick with Google services but they seem to be doing that anyways. One drawback in having people build their apps on top of you platform is that then you are stuck with the way things are. If you have popular apps depending on the current task system, you can't just take it away or move it to Google+ (or you can, but then you get lots of whining).