Dual bladder wings are not an immediate solution.
Having both inflators connected would make it very difficult or determine which one would be auto inflating, so only one is hooked up at a time.
If that one fails, there’s no way you’ll be able to identify and inflate the other one to arrest your descent in a reasonable time frame. You’re still a lawn dart.
There’s no way you can arrest a rapid descent caused by heavy steel doubles by orally inflating. Everything is working against you. Ears screaming. Gas compressing in the wing as you descend. Putting enough gas in the wing orally since its starting empty. Ain’t happening.
With light tanks, you could kick your clippers to stop your descent.
With a drysuit you can press the button to stop the descent.
Just to play devil's advocate ...
If you have a BC & DS, if both inflators are hooked up, then you are in essentially the same situation. As far as I know, pretty much everbody diving dry also has their BC hooked up.
I'm having a really hard time figuring out how any of these buoyancy sources are fundamentally different, except that a DS probably has a higher chance of "failure" (flood) than a bladder all things considered.