Yea, but...
...as with everything else in the world, home computers are accumulating moving parts like an SOB. The same thing is happening to them as is happening to what's under the hood of your car. More on the software side than hardware, I mean. There are a lot more pieces to maintain the current release of (and the releases come out at an increasing pace). And there are a lot more pieces where something might go wrong on the right release. And each piece just gets bigger and bigger. More lines of code.