I'd say you can get better tracking infos using the app. You don't have any browser regulation there, just request some more access and you can track your users location, their contacts etc.
This whole opening means that IG now officially supports the mobile browser as an alternative to their app, so less restrictions/more functionality than a PC browser.
With this update I'd see it as almost required that the embedded browser gets custom User-Agent support. It was requested often but there was just no use to it, but now it's a different story. There should be an option in MP to use the User-Agent of the device it's emulating for the current account in the EB.