Why separate Stack Exchange accounts?
When I visit a new StackExchange site, I have to go through the hassle of clicking log in, selecting "Stack Exchange" as my ID, and giving my credentials. Then the StackExchange site I'm on gives me my 100 points or whatever so it clearly knows who I am. In fact, in another tab I'm logged in to StackOverflow. So why am I not automatically logged on to new SE sites?
It's especially annoying when I am browsing SO and I click one of the suggested articles that happens to be from another SE site. All of the sudden, I'm on a site where I'm no longer logged in but need to supply the exact same credentials as before.
Update The associated possible duplicate has only one answer, which is explaining why separate accounts are needed for each site. My question, however, is asking why I don't get automatically logged in to that account, since it is still associated with the same credentials. So when I go from StackOverflow to cooking.stackexchange.com, I'm using the same credentials so why not automatically log in to my cooking account? To me, that's an obvious way to promote cross-pollination