@Sitemount_Stu
I am starting to dislike the attitude here...
No offence directly intended, but it does come across that if it has a Razor badge you love it, if it doesn't, you don't.... that's just an observation, not a judgement!
Unclipping from the D-Rings happens at a moment when I have other things on my mind.
I often forgot or entangled one. Double-enders I dropped frequently when the water was moving.
This i would put down to poor technique on your part then. There is plenty of time during safety stops where cylinder manipulation should be a breeze and frequently dropping double-enders is purely poor technique and not something i would envisage most people having a problem with. On that basis, if it's your justification personally for not using this technique, no problem, whatever works for you, but the forum is offering guidance and advice for the many, and in this case, still stands as good solid advice (IMHO)
They also had absolutely no effect for me, the bungee was never stretched enough to pull on the additional clips (be it double-enders or bungeed boltsnaps), they where moving around without pull on them and became a hindrance, so I got rid of them completely.
Before that I made several tests snapping the bungee on purpose and could not find any way to endanger myself with that.
Again, if this is your experience, then fair enough, however I feel certain that this is not the wider experience. I don't admittedly have vast sidemount experience myself as i'm reasonably new to it myself. However, having taken verbal advice from one of the foremost Sidemount instructors in the UK and Europe, I tried this for myself and immediately experienced the benefits exactly as described.
Btw.: neither Steve Bogaerts nor HP have those clips on their rigs when they put up tanks for display.
I also do not see any sign of those in Patrick Widmann's Stealth pictures.
I'm not certain, but it's possible you've misunderstood the equipment in this case. The "only" thing that is left on the cylinders is the loop of marine chord around the neck of the cylinder, only marginally bigger than the neck itself. The double-enders in this case are usually clipped off at the butt, either on the ring, or within a pouch and retrieved only at the point they are to be connected, they are not left in place throughout the dive. After entry the bungee loop is connected and the double ender removed and stowed, brought back out for re-connecting, usually during the safety stop, prior to exit.