~100 years ago, most people either know how to do most of these things or had an immediate family member who did. Today, that's no longer true.
It probably would be better if we all still usually knew how to do all these things (at least in my opinion). But we collectively decided that it was more important that most people just know enough to keep themselves and some kids alive between shifts at work.
Just because a bunch of us have the blessing of the ability to cook food doesn't give us license to expect all our fellow citizens to do it when we have actively encouraged them not to need this skill anymore.
I'm lucky that my mom taught me basic sewing repair, and I really wish most humans knew even basic sewing because of how staggeringly wasteful modern fashion is. But most people would call me crazy if I started insisting that everyone should know how to sew and that people who don't are inferior, irresponsible, etc.
Even if they didn't, how likely am I to convince more people to sew if I come out swinging with insults?