You answered your own question, though. Some people are just lazy, but a lot of people were never taught home repairs, even the basic ones. I grew up in rentals and apartment buildings, so when something broke down, we called the landlord or the property manager. Repairs were included in the rent and security deposits, and rentals tend to have cheap fixtures anyway, so they're more likely to break down.
I don't count cooking in the same vein because everyone needs to eat, so cooking is a skill that will serve you on a daily basis. But some home repairs don't need to be fixed immediately, such as a light switch or the dishwasher, so it's easier to call someone to repair it. For what it's worth, I wouldn't know the first thing about fixing a toilet or a leaky faucet. That's the beauty of Google and YouTube, because you can find a step by step tutorial to do so.
IA that HHs getting rid of appliances and flooring in good condition just to have the current trend is silly. At the very least, I hope they're donating those appliances to an organization or people who can use them. I cringe when I watch shows like HH Renovation and the like, where they tear out perfectly good cabinets and tile and trash them. It just feels so wasteful.