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And more fun, lots of laptops have really goofy routing. I’ve got one where the DP alt mode on the USB-C ports are on the dGPU, but the HDMI ports are on the iGPU. And the internal panel is on the iGPU unless you switch it to be on the dGPU because yay mux.
Why? I don’t know. Too much meth while laying the board out or something I guess.
The EFF has had a couple of websites that would profile you on exactly this data, so you’re completely correct in that even the basic normal required metadata is more than enough to identify you pretty well.
coveryourtracks.eff.org is where it’s living now, and a quick glance shows that just using browser capabilities and such is absolutely enough to identify me.