IIRC Foxconn does Apple mobos.
I'm not saying this point is in favor of Apple, I am just saying that with variety and customization, there are risks and there are some purchases that are better than others. If you do your homework, you can put together a very stable, very reliable PC. Or you can pay an OEM to do it for you.
In this sense Apple is basically just a very very successful Dell, or HP, or other computer manufacturer, since these days the hardware differences we saw in previous generations of macs (e.g., using non-intel chips) are largely gone.