Earlier quoted context omitted.
It becomes a mess to track where you are logged into what. And cross domain tracking.
2 accounts can take care of this. You can have one account for life related things and another one specific for Logins. I personally don't care. As I have nothing to hide and I trust most of the businesses providing federated logins. Also, makes life a lot easier. Not only as a developer, but as a user.
Sorry, but every time someone says the phrase "I have nothing to hide" I have to roll my eyes at them. How is that 'argument' in times of the recent facebook scandal still a thing?
I know that most people live under a rock, because changing habits is damn difficult and its much easier to make up arguments to support one-selves behaviour than to question and change it, but really these people should start waking up soon.
It seems they are led to the corporate social media butchery where their personality and individuality is taken piece by piece and soled to the highest bidder.
How much has to be taken from you before you recognize that you can be remote controlled by the organizations with power and money?
And will you even have still the will to recognize that and try to change it or will you sedate yourself with the argument that you can trust big brother to watch over you, because he knows best and its so convenient not having to make changes or decisions anymore.