Seats are hairy things.
In the early days they killed, often on the ground, more than they saved.
Safety became such a watchword that it is now rare to hear of a ground incident.
Don't know the modern "seeing off" format, but in my day the seat was the last thing to have the safety devices removed before take off, and the first to be refitted on landing (except for rockets - we actually used to have to go out and connect/disconnect those on the end of the runway!).
We can only speculate, of course,but the first thing I would be looking at is were all safety devices in place, and if not why not.