I would like to see it added to android phones. It's a small addition, and I don't think it would be hard to implement, since most android games allow screen rotation.
Without it, it is difficult to play with earphones on. Earphone jacks are mostly located on the top left side of the phone. If rotated 90° counter clockwise, which is the default orientation of classic, the earphone will block your left hand and it becomes a bit uncomfortable to move. If rotated clockwise, however, the earphone wire will be on top instead, and it will not block your right hand.
I think this feature should be added simply because I don't see why not.
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