Earlier quoted context omitted.
This is a terrible idea. Even if you're going to do this it's far better to be a toggle on software rather than tying it to the port you're using.
But you can see what state the laptop’s in from across the room.
I can say though that I've wanted to be able to plug a device in on both the left and right depending on location and usage. I really wouldn't want to lose that functionality for this, particularly when a simple software toggle is more flexible long term anyway.
9 times out of 10 I am going to use the same charge mode at the same physical location (e.g. at home, slow, at work fast). That would be the real killer feature, geo-fenced software toggle that knows where I am and what mode I previously used here.