Why is bruno getting dropped from pen duties when he scores about 99% of them ? with a high success rate why disturb the balance ?
Well, perhaps he won't be (stranger things have happened).
But if he does get dropped (as most expect he will), the answer is obvious: so that a statistically worse player with a huge ego and a desire to score as many goals as humanly possible gets his wish.
Hard to spin it any other way.
However, we've decided to bring Ronaldo back - it's obvious that he will have to be accommodated in various ways, that's part of the deal. Expecting him to turn all humble all of a sudden is unrealistic - and what you potentially gain from blowing a bit of smoke up his arse is...a player who can still be a lethal finisher and win us matches (maybe even big trophies, who knows).
Plus - as many others have pointed out - he isn't a sub-par penalty taker. He's pretty good statistically. And the number of pens we get this season should be lower, perhaps even dramatically so. All in all, we may not lose that much from letting an inferior (statistically) player take the pens - and if this keeps him happy overall, it could be worth it.
I just hope he won't be allowed to waste free kicks at will - that could get seriously annoying before too long.