Still NSA and their likes do collect and store all this data, so effective privacy/data protection/anonymization is still a task of the users themselves and their client tech.
While the app Drude mimics the messaging hub by combining fetched notifications in on view, it's a question of when but whether the hub will finally be brought to Android and iOS as well.
Windows Phone may be dead, but Windows 10 is continuing the path to run on both Intel and ARM and on all form factors with the same codebase, so finally the next desktop PCs may be smarter than smartphones and equally mobile, at least their core.