I know PCs usually are a few years behind technology wise.

I am an IT technician, and it takes a lot of confidence and ignorance to be this wrong.

I'm kind of surprised they still don't have bluetooth as standard.

This explains so much about your earlier statement, you seem to think that there is a a standard PC, there isn't.

There are hundreds of manufacturers making PCs and PC parts.

I have never seen a laptop in decades that lack Bluetooth, however there are still desktop motherboards you can buy without wifi or bluetooth, but this is not my reason for making this post...

I am pissed because I don't get why you wouldn't just put the required Bluetooth into the PSVR2 PC adapter unit.

That usually depends on if the PC has an inbuilt Wi-Fi chip. The Bluetooth controller is usually coupled in the same chip. So PCs that lack Wi-Fi usually doesn't have Bluetooth.

I am just confused as to why the adapter itself doesn't have a BT reciever...