The PC market is not comparable to the Apply market. With the PC, you see cut-throat competition on the hardware and the result is what you see. An OS that you may find dificult to install.
The Apple is more like a walled garden. It can be much nicer, but you have one kind of beer and you'll like it.
I do not expect a computer to die so soon- nor should Apple owners.
If it was a washing machine with the same short life then the seller would have to pay damages for the lack of durability. (Recent UK law case). I look forward to someone suing Apple on the same grounds.
My costly experience may not be the result of planned obsolescence but a pretty machine with sloppy engineering amounts to the same thing.
A PC main board replacement bought off the shelf costs in London only 10% of a iMac main board replacement through an Apple dealer.
I use Apple machines but Apple Care is now a compulsory overhead in any budgeting.