I will ask this again. Why is nobody here interested in building one app that does it all? Nobody wants to have 100 apps on their phones, or create 1000 online accounts. Such an app would easily make most tech companies obsolete. What part do people not understand?
Besides, I don't want to migrate everything I do online to a smartphone (it would have to be Android or IOS then, because that's all they support of course — vendor lock-in is not so great for innovation) or a sanctioned PC OS. In fact, most of the time I don't even want to run some service's software, except for those that run in the sandbox that is my web browser (i.e., websites and web applications).
Actually, all things considered we already have that one app that does it all; the web browser.