If the rules stop you adding equipment that makes you safer that does not make sense.
Except that pilots do have a long track record of claiming that everything they ever wanted to fit, up to and including the kitchen sink, is making them safer. All the while reducing structural margins and pushing pilot workload up.
There's virtually no history of any of these devices - apart from ballistic parachutes - actually saving lives. There's massive history to say that the safest aeroplane in the world is the one with a well trained pilot in it who knows their aeroplane well.
Also the majority of the lives saved by Ballastic parachutes have started with pilots f****ing up and getting out of their depth in the first place. In the UK, where the same aircraft are flown lighter, we have less accidents than Germany, and very few where a BRS would have helped.
G