Bunting, imo, is in a similar category. Some kids will excel at bunting. Some should know how to do it because "you never know". But for some, it is just a waste of time to have them work on a skill when their time could be better spent improving other areas of the game with skills that they will use frequently.
Osric, while I agree with your basic premise of this, I disagree that this isn't something to spend time practicing and improving. Just like righty slapping. It's not something that is used very often or maybe not at all. However, it just gives the players another offensive weapon with which the coach can use in certain game situations.
A perfect example. Last year our team was down by one run (2-1) in the quarters of a tournament. Both pitchers were very strong and hitting their spots. There was 1 out and we had runners on 2nd and 3rd. #4 batter came up, showed bunt, pulled back and righty slapped the ball (hard grounder) in the 3-4 gap out to RF. Both runners scored and we ended up winning the game to go to the Championship. Everyone expected the team to go for the tie but because I taught them how to slap, we had the go ahead run score. It's just another weapon in the arsenal. Had they not practiced it, they would not have been able to execute it.