But you say all you did and then contradict yourself with the oem talk. Oems need to make a profit on the hardware. So they are going to end up charging a lot more for the same console design than sony or MS will charge. You forget about a lack luster ps5 pro at $700. You may end up with a xbox oem at $1,000 that performs the same as a $500 ps6. That is where another problem lies.
PCs and consoles are very different products. I would suggest looking at windows vr headsets vs oculus and the index. MS went the oem route and now windows vr is dead. Too many headsets with slight changes , a bunch of them with underwhelming quality and performance. Oculus and valve decided to build their own and they are still around selling hardware.