When you dash dance with a character the instant you turnaround your character actually stands in place for a frame, and if you reset your stick to neutral on that frame you will essentially stop in place and be able to instantly do any grounded move other than neutral b. As puff's tend to spend a lot of time in the air I wouldn't say it's quite as useful, but I have seen Hbox pivot f smash or grab to tightly space around a Fox drill and punish for example
Also I wouldn't say it's super important with most characters competitively. I do think it's extremely useful and I personally do it all the time, but most people will only pivot grab and smash attack (which are easier than some other options) if they pivot at all. I do think it would be beneficial to learn however