Personally, I think that this would be a great feature for the competitive scene. As I do agree with what bestfriends was saying, that it could be abused through scouting. I'd still love this to be added in. As for the scouting part, I think that it really wouldn't be THAT bad of a problem. I mean, yes it would suck but really if you check your opponents health once you'd be able to remember the HP percentage for a few minutes, then you check again. With scouting, the only bad part would be that the cheater would get confused at one point with so many people saying different things.
In conclusion, I think that the pros beat the cons and that this should be added. :)