I agree that a fleshed out system is best.
But I endured the late 90's and most of the 2000's with some pretty bare bones Replay systems. Like I'm pretty sure the Dawn of war/Company of Heroes replay systems didn't have anything but Fast Forward and pause. and I still used the hell out of them.
As it stands this product doesn't even have the features from 2 decades ago. That's pretty telling. Sure, the depth required has changed, but it's still usually considered a 'ship with' feature.