This is where i think my thinking might be different from most of you, maby due to the fact that I am not diving a rebreather, or maby due to my background in the DIR philosophy and mindset, personally I would not even consider a rebreather if I did not think it would allow me to do some of the dives i do/want to do more efficient.
I believe that beside the fact that you are adding some things to the equation ( which you always do when you go deeper, longer ) but that should not change what you have already added, you should simply use a tool that fits into your existing diving, but just adds some possibilities, which is why I dont want a computer controlling Po2 or deco, I dont use one now for my OC diving, then why should I in a rebreather ? - same with OTS counterlungs, the ones I have seen would interfere with the way I wear my stages, my working boltsnap, and my backup lights, and even how I would store my primary light on ascent, besides i like to have my chest free.
I know it can be done - maby it just aint done yet
the flood recovery is a good point, i did not know that - do they flood often ? is this really a factor you would consider important ??