The best ones have heavily depreciated

Yes, like I said, actually used cars. Not something that's 2-3 years old. Those still have a ton left to lose.

I would argue no one should be buying a car with the intention of selling it later, because all cars depreciate terribly

They all do, but unless you want to be stuck with the same car until it literally dies, you're selling it. If you're buying a fairly new car, you're likely not planning on keeping it for 20 years, because if you're ok with driving a 20 year old car, you should just buy a 10 year old car and drive that for 10. And if you are planning to sell in about 5 years, which is what most people keep their cars for, used or not, wouldn't you want the one that loses 30-40% of its remaining value in that time, over the one that loses 60-70%?

The warranty does not care about the value of the car, it’s only for parts and repair so what you said doesn’t make any sense.

Unfortunately it does for some manufacturers of nice heavily depreciated EVs I'm eyeing ctrl+f "current value". I'm sure others will be following suit. Guy on reddit got told to piss off by dealer because battery replacement was going to cost 60k pounds and car worth 40k or less. Basically put up 20k of your own money to get a warranty job done, ridiculous. This with the manufacturer deciding the price of the battery in the first place because LG or whoever sure as shit doesn't charge them anywhere close to that amount.

No one should be buying a car they can’t afford, and definitely not with a loan they can’t safely afford.

And yet most people do. So when you've got 15k left to pay on your car and get laid off with only 6 months of income saved up (which is about 100x more in savings than the average person in some countries like the US) and have no idea if you'll get a new job in 3 months or 2 years, would you rather the market value of your car be 20k or 12k?

There's always refinancing

Yes, pay even more money by extending your loan. On something that's already underwater. This is why Americans for example are so fucked with vehicle debt. Many of them roll negative equity into their next loan, and the one after that and... you get the point. Soon the loan principals get much bigger than the cars are worth. Made worse by ever longer loans terms that are designed to sucker you into exactly that.