The center imaginary line foot fault is nothing like stepping over the line like you just referenced. Stepping over the line actually does give a big advantage to the server and is understandably upsetting if someone did that.
Suresh I can see your point about the rule needing to be followed equally but like I said it gives no advantage to the server to be so close to the notch. If anything it hurts them. I love playing guys that stand a foot or two from the notch on the deuce court because unless they're 7 feet tall they have no angle to work with hitting out wide. It's extremely predictable that they are planning to hit down the T most of the time. I remember when Safin moved so close to the center later in his career and thats what he did, hit down the T almost always on the deuce court.
Who cares what you like doing? The guys who made the rules recognized that it was a bad idea to let the server get that big an angle, to drive home the point, if you were allowed to serve to the ad court from the outside of the doubles alley, in theory you could serve so wide that the receiver would be about a block off the court-just like when an approaching net player has a sitter and hits it almost parallel to the net. But that's not even the main point, sureshs stated that: You don't get to decide if it is pointless or not, or whether it provided any advantage or not.