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DOTA 2 has this and I love it. You can pin the camera to either the view of a specific champion, or to what the summoner is looking at. I feel it adds a lot of options - say I'm watching a ranked game with a singed in it, and I want to learn to play a better singed. It would be rewarding to be able to follow him around all game. It would also be rewarding to see where he's looking and when, at mid lane, at bot, etc.