I've seen these as well but prefer to think in terms of four gears because, well, it's simpler. Also, I disagree with aerobic recovery being very slow and aerobic training as being at marathon pace. Perhaps there are days when a VERY SLOW run has a place but if you can't hold 70% of max HR, then the benefits of a run are so small that it would be better to take a day off or crosstrain. To then do the rest of your aerobic training at marathon pace is to train at an intensity greater than you need to get the changes at the cell level and less hard than you need to get maximize LT benefit. Why bother?
From personal experience I have found myself doing two different kinds of LT workouts, but it seems more germane to racing to think of these as easy vs. hard workouts rather than worrying about how everything correlates to some theoretical race pace. Last time I ran for a team, a while back, the coach would say: "okay, lets do mile repeats at 5k pace." Sure. Then we'd all go and do mile repeats at 3k pace. Competitive natures are what they are. I think he and we would have seen better results if he'd said, "let's all work on improving our lactate thresholds today by running comfortably hard" and then taking everyone's watch and not calling out splits.
To think about 8 zones is to overthink training, in my opinion.