I think, if you rope without parachute, you ''can'' achieve the same level of speed as you would with parachute. Of course this is without parachute handling techniques, and general falls here and there. You just have to be consistent, as well as fast, precise, and time your spikes and any other tricks for maximum efficiency. But this is hard to achieve at times, and you have to be a robot or TAS.
I agree that with ldet as well with bounce, you can get more out of your turn as you would without parachute. Because In a turn, where you would normally fail, you get to recovery Instantaneously in motion, but then again it depends on the type of fail and speed.
I like all of yours thoughts on the matter. Because of this, I think I may add Ldet to ZaR RR.
The foundation of ZaR is for it to offer a harder alternative. Think of it as a video game with difficulty settings to choose from. That's basically it. The higher the setting, the more difficult it can become the more the player has to overcome that new obstacle, setting, & challenge. This analogy might be flawed though. But I think it holds up.