I am more used to seeing either higher speed with slower rest or slightly slower but constant.
That's why I hire a coach… I just do what she tells me. HA!
I guess it helps you get used to staying at high intensity with less recovery between intervals. I suppose it simulates running on hills where you're going hard, but have to go harder on the up-hill to maintain pace. That's what the "over-under" intervals I did today on the bike were for - simulating riding with a group where the pace is changing and people are attacking on the hill but you can't recover between attacks.