Interesting, a possible fringe scenario.
But even here, there are just SO many ways to get advantage. For ex. If you're a bladesinger and you know you're going to get disadvantage against a high AC opponent?
More than likely you have a familiar, have the familiar provide the help action. You now get 1 attack normally and one at disadvantage - still better than just one attack with advantage.
But the bigger point is (IMO); even for a bladesinger, who can get slightly better use of the spell than any other wizard subclass, it's a waste of a cantrip slot!