Google will do anything it can to get apps on its store, but let's face it, Apple has the better apps. Because Apple has the better apps, they want to choke off Android while trying to incentivize more devs to make apps for them, so they have a client stack that is as different from Google's as possible to make it hard for devs to switch over.
The browser can now handle DOM traversal in ways that weren't possible when jQuery was invented. Plus, new libraries have come along that offer a totally different approach to DOM traversal than the one we've grown so accustomed to. So, it seems like a fair time to ask, do we even need jQuery for DOM traversal anymore?