So few buy used hardware. I got a used Dell laptop and the WiFi card was shit. Dell doesn't always make the right call but because WiFi card was a replaceable PCIe card, I was able to get more life out of the machine. On the one hand it was good for me. On the other hand it was bad for Dell because I didn't replace the whole machine. Dell is learning, however. Their new machines have every thing soldered in place with no pesky upgrade/repair options, not even a stray NVME or RAM slot. It's amazing they left a USB port.

I've used PCIe a lot for storage and networking applications in laptops, servers, and desktop form factors. It has allowed for much cheapskating--which is why it's got to go. Repair and expansion options are bad for business.