I spy with my little eye an oxymoron!
OK, the differences are:
Normal fibre wrap bottles have a 2 part construction, a rigid aluminium inner that extends to the neck where the reg screws in wrapped in a glass fibre outer shell for additional strength, this composite of the two gives the whole more strength than either material on its own for the same overall thicknes/weight.
Stako bottles are made of three components, an aluminium neck piece, a flexible plastic bladder and a carbon fibre outer wrap, this makes them lighter but there is the ability for the bladder to contract when emptied, allowing air to escape through the outer carbon shell when refilled.
As for flash filling, no bottle, steel, aluminium, conventional fibre wrap or Stako should be flash filled! Go to a dive shop and see the care and time they take over filling a tank.
With Stakos that have 'exploded' in the various incidents it is normally the reg that has been ripped out at the threads, basically blown out of the top of the bottle. To keep weight down regs often have a high magnesium content in their alloy, magnesium is highly flammable in its raw state and alloys with a high magnesium content are more prone to igniting. During flash the friction created by forcing a large volume of compressed air into a small space causes a build up of heat, if there is the presence of any containments, especially mineral oils, this can cause ignition (like a diesel engine) and lead to a fire in the bottle. If the material the reg is made from then ignites and melts you don't want to be there when it does.
All high-pressure vessels are susceptible to failure under flash filling, in the case of Stakos, the liner, being made of thermoplastic, is more likely to ignite, given the right circumstances to do so.
