Question Why no upgradeable GPU chip?

MeeLee

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Aug 27, 2014
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If graphics cards use relatively the same interface for the past 20 odd years (PCI express), how come they were never released with upgradeable GPU and VRAM sockets?
It appears to me that the board would be largely the same, save for more cores, smaller die GPU packages, and more ram.
How come we haven't seen 'upgradeable GPU cards' for sale, when everything else on the PC seems to be upgradeable?
 
Manufacturers like money. Plus that’s a huge assumption that the boards would be the same for 20 years they would not