I don't personally find Robin's foxtrot to be much use as a movement tool. It can help as a small adjustment to your spacing, but despite having such a terrible initial dash, she wasn't compensated with any flexibility; by which I mean that Robin's dash is still a commitment despite being so short and slow because the cooldown on her dash is deceptively long. It tends to catch me off guard because it looks like she's stopped moving already, so I go to jab and DERP DASH ATTACK HOPE I DIDN'T JUST HIT A SHIELD. It's really frustrating actually, lol. That said, I do think that foxtrot still has applications; if your opponent isn't intimately familiar with that same cooldown, you can sort of mindgame them by doing initial dash -> Robin has stopped moving but is still actually in the dash cooldown animation -> dash grab dat shield. Our range on dash grab is at least tolerable, so you stand a decent chance of catching someone this way if you can make them expect a jab or Ftilt.