All of your criticisms assumes that there will be problems with the tailgate and there is absolutely no evidence or information that would suggest that. You should at least wait till there actually are problems before you cast off a new feature. The problems you speak of don't even exist.
I also think that its hard to judge a feature like this without seeing it work in real life. Maybe instead of being plagued by problems, it will impress everybody by how great it works. I'm just saying that all this speculation is not really based on anything concrete.
You dont need evidence. What is a tailgate? A tailgate is a metal board that folds downwards, mounted on pegs and suppored with thick metal wire. There is a handle to disengage and some of them have simple locks.
What happens when you add extra hinges and multiple release points, it introduces a degree of complexity into a simple system that was already without flaws. Complexity ALWAYS breaks, there are too many links. Instead of two simple pivot points there now has be outward swinging hinges as well as downward swinging hinges, plus individual release mechanisms for downward and out swinging on BOTH sides. You've more than doubled the amount of components, FOR A TAILGATE...
Why should we wait for a system that no one really wants regardless, its backwards logic. There's a reason wagons with a similar system went away in the past...