I think the thing people are missing is that the price to extend the AppleCare+ is annual only, so if you’re on a 16”, it’s $149.99 a year. And that’s fine for a brand new machine. It’s a law of diminishing returns the longer it goes on.
Like, I still pay $60 a year for AC+ for my iMac, even tho it is 4 years old. But even that will cease to be a good ROI at some point. I’m doing the same thing for my Studio Display, paying $50 a year for a $1600 display — but again at a certain point, that ceases to be a good financial investment.
For displays and even stuff like iPads, the relatively low price and the long lifespan of the devices makes it make sense, imho to extend coverage up to a certain point.
For laptops, I think it faced with $150 a year post year three, it probably only makes sense for at most, two years post expiration because by 5 years post purchase, that $300 (plus the $400 you spent for the proceeding 3 years), could represent more than 70% of the value of the laptop.
For instance, a used 16” M1 MBP with 32GB and a 512GB SSD in very good condition is under $1200 on eBay and that’s at 3 years old. It’ll be even cheaper in a year. And even cheaper a year after that. So at a certain point, it makes zero sense to spend $150 on something that might have a value of $600 or $700.