I believe the assumption is that a future civilization will be less advanced. Should society collapse, you can expect knowledge to be lost and advancement to ce

I believe the assumption is that a future civilization will be less advanced. Should society collapse, you can expect knowledge to be lost and advancement to cease. Sure, we hope that our civilization will continue to advance, but we plan for the worst and leave the message in simple language in the hope that the last remnants of mankind will survive by avoiding a serious threat left by their ancestors.