I agree wholeheartedly with both of you. As soon as we have a "Frontier is the best ULCC..." thread, they do this.
I suppose one could open 2 browsers to be able to look at the one way prices for both directions, but it's just the idea that you have to jump through these hoops in the first place.
The round trip prices, as such, are uniformly awful; much worse than I remember for the routes I was checking last week.
Let's hope for immense pushback on this "enhancement"; it is utterly ridiculous.