I’m still sticking with my AMD Ryzen 5950x with Radeon RX 3900. That’s still going to beat Macs.
This is for people who have gaming PCs. Steam Link for macOS allows streaming from your Windows PC to your Mac. I have a gaming PC running Windows, and I occasionally stream games on it to my MacBook Pro, iPhone, NVidia Shield TV Pro, etc. I'm less inclined to do so after getting a 165Hz monitor, but there are still times where streaming to another device in the house is a nice option.
Of course this is not new, you could do this with the regular Steam app on macOS, but this is in the Mac App Store, and may be better for people who don't need the full Steam app on their Mac and only need the streaming client.