I'm not sure that's how people think of it, if someone just came up to you and said that your desk is coming up on 5 years and you should replace it, or your car is nearing a decade and you should replace it "just because", I'd be pretty hesitant.
If your current 12 year old car had a 2 star crash rating while the newer ones had a 4 star crash rating and you knew there were people on your daily commute actively looking to smash your car, you'd probably want to upgrade. Same as if there were people roaming with flamethrowers ready to burn down your wooden deck unless you get a fire-resistant deck installed.
Also, this car/deck costs less than $100. Security holes aren't a "just because" thing.
Current cars aren't going to last a full decade without some repairs and maintenance. People don't maintain their computers very well. And upgrading your operating system is part of that maintenance process after a while.
Plus changing computers is probably cheaper than a new transmission after 10 years.
Yup, exactly: Ashtray in the car is full? Well buy a new car then! (I'm exaggerating, but you get the point: most stuff is built shoddy and unrepairable - for you to buy new shoddy and unrepairable stuff to replace it)
