It absolutely has to deal with a Steam account every single time I log in to confirm ownership of the title. And then again every time I make a purchase from my Steam wallet. And again every time I connect to a friend through my Steam friends list.
It's literally adding another potential point of failure and removes none of the necessities of dealing with the other service. I only suggested the server load bit because I can't for the life of me understand how you can think it's "easier" to insist that these two systems interact in a new way when they're already up and functioning, and the original reason account linking was disabled was to make the game more stable.