I suggest you read about Ufton Nervet.
Yep. Zero passengers died because of seats shattering and these bits flying around like missiles. Thanks for helping to back me up.
To be honest, I see zero recommendations relating to the seats. Only seatbelts and window strength.
OK, so the low seat backs dont help when it comes to whiplash, but I cant think of much else.
The only other possibility (although no sign of this in a report) is if the corner between the base and back of the seat is weak enough to cause the seat back to push forward, if the person behind flies into it. That will cause a problem. But nothing about it at all.
I still think this is all going too far though. All seats are going to cause some problems no matter what design they are. Considering how rare accidents are, and the fact the coach is already very crashworthy, and the fact seats are only showing up for minor injuries (which they will always cause anyway) I just think its going too far. I could understand if they killed people, but its all minor injuries. Crikey, I expect minor injuries in a crash. Id expect minor injuries with any seats.
To be worried about it id need accidents to more more prevalent.
Im more worried about cars though, and considering i drive, i find it hypocritical to worry about IC70s, and yet still drive. But thats my opinion.