I can think of some useful places to use this. Idk, imagine these situations:
1.) you're throwing pikmin. Your opponent has decided to try and kill the pikmin instead of approach you. you run in for the grab to punish his lag like you're supposed to. You grab, he spotdodges and grabs you. he dthrows and it sends you up into the air. You find a seemingly open opening in his defense while he comes up to attack you. you decide to fair. He attacks you as you fair! His attack comes out just as fast and kills the pikmin. (it was a red) You have no pikmin! You fall to the ground in a frenzy and tech the ground. he's running at you. You know he's going to jump over any pluck canceled fsmash. His dair beats out your upsmash. What do you do? You could stand there and pluck some pikmin, but to what use? He's about to attack you. Instead, you pluck cancel into an upair ftw. lols
2.) this allows you to use aerial attacks off of platforms...even when you're got no pikmin! It's epic mindgames.
3.) You've got no pikmin after hitting your opponent off the stage for some odd reason. You don't have time to pluck. You edge pluck cancel into a fair or dair. Is that not cool?
I'll be on aim in a second.