My understanding is that although "Carbon Fibre" bottles meet all the recommended safety standards, but it is the fact that they are carbon fibre which makes them more susceptible to bottle fires. The risk is substantially reduced by a fill rate lower than is standardly used.
Most sites will probably have there fill rigs at a level that is suitable for standard fibre wrap (Aluminium/Kevlar) upto 3000psi, but too high for Carbon Fibre. When you take into account the amount of heat generated filling from 0 - 4500psi compared to from 0 - 3000psi, it is highly possible that some sites filling to 4500psi and some to 3000psi are perfectly safe for standard bottles, but fill too fast for the "Carbon Fibre" bottles.
The issue then is where/or with whom does to problem lie
"Carbon Fibre" bottles - Well the bottle is perfectly safe if used within required limits. That is proven
Fill rig suppliers - Well the rigs and fill rate will have been tested against standard bottle styles and caused no incidents. Again Proven
My view is that "Carbon Fibre" bottles were designed with sup air tournie players in mind, who normally just top up after each game as opposed to full fill.
If you wish to use one then only fill it to 4500psi at a tournie on an H-PAC fill station, which we all know are set up to slow fill within the tolerances for Carbon Fibre bottles or if you are at a regular site then fill only at a slow fill 3000psi output.
The end of the day, you may not be bothered about your life, but think of the half dozen or more stood around you are well.
Each incident is getting worse, thankfully Nige will be back to shoot another day. If you heed the warnings - we will stay safe