It's great that manufacturers stand behind their warranties however many items are designed to fail not long after that warranty expires. Case in point - I just repaired a switch.. was 2 months past its warranty when it failed. The cause - 10v Capacitors failed on a 12v circuit on the PSU board!
Similar thing about 10 years ago with a Toshiba surround system at home.. caps failed within 2 months of the end of warranty, fitted higher voltage ones and its still going strong to this day!
With Phones, tablets and laptops, the batteries are the most obvious point of failure and will lose quite a lot of capacity with a charge a day over 2-3 years - if they don't fail fully that is/