Not mine to second guess God's plan, but someone is going to have to teach many of whatever youngsters who survive how to do things as they used to be done (40-50 year old tech, precomputer and later). Some of us remember, and the more we can pass on, the more likely they are to pull something resembling civilization from the ashes.
It's never too late to learn how to build water wheels, rig generators, build (and design) septic systems or water purification setups or even something so mundane as a road... The more we have documented and safe, even if we don't survive, the better the chance some bright person will discover it and put it to use.
You never know.....