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It appears I either misunderstood or misremembered what I read.
It probably referred to MAC addresses being reused on WiFi. However the frames used are not Ethernet frames.
Ethernet however is not restricted to twisted pair cat cables it’s on fiber and originally was on co-axial.
I think I had a Voodoo 3 at some point. Then a Voodoo 5 at the family PC.
Then on my own PCs Radeon 1900Xt -> radeon 4780 -> radeon 7770 -> radeon 480 -> rtx 2070 super.