KBPsen
They should be short, to the point and convey the very real and serious reasons for giving the instructions in the first place.
You mean, like telling the pax that take off and landing are the most dangerous parts of the flight?
You mean, like telling pax that in an otherwise survivable crash, smoke is the real killer but airlines don't want to change the fabrics they use or install water sprinkler systems or accept mandated use of smoke hoods?
I agree but - That'll be the day!