Because most people don’t want or have time to deal with remodel. ESPECIALLY when you have 4 young kids.
As long as everything basically works, why does one need to do a full gut remodel immediately? Slap some paint down, put down new wood or carpet, and just live in the house, fixing things as time permits.
The last house I lived in growing up had a kitchen from the 1940s. We put in a new dishwasher under the counter, re-tiled the floor eventually, and it’s still being used as a rental, as is.
BTW, kids in grades 9 and 11 are old enough to help with re-model. Learning to work with their hands rather than play with their iPad will do them some good.