If I understand what you're saying then its not really a popular thing to do, because most people camp ledge example m2k on the ledge with sheik, it's bad idea to short hop dair off the ledge not a good option indeed, in fact in that situation you should just sit back and short hop laser never mess with a person on the ledge because they can and will punish you. So going back directly to your question there are just to many safer and in my opinion more flashy ways to use the dair, now the bomb solider a popular technique before but not now, looks pretty good for a finisher and would be good if you are up on stocks and wanna style on a opponent but remember I would practice doing this before use in a real tourney or competitive scenario to be blunt yea it could be used but people just dont do it anymore hope I answered your question bye.