Well I bought AppleCare because of the keyboard and I regret it. They refused to fix the nonworking keys because of a 1mm scratch on the back of the top case, saying it voided the warranty.
I had the keyboard of my MBP 2017 replaced for free. Also, the display died roughly at the same time. At first, I thought it was a problem of the flex cable, but later I discovered a small crack. The Apple Store replaced the entire display for free, what is usually a $800 repair. I guess it depends a lot on the store, the country, maybe even the person you talk to.
So just a few hundred additional bucks wasted.