I don't understand how Intel could screw it up that badly with it's massive resources.
Then I also don't understand how AMD keep pace with Nvidia (broadly speaking) when they've such meagre resources in comparison.
I get the CPU side of it, Ryzen caught up because Intel were lazy as they'd no incentive to develop further knock-out CPU's when they had zero competition in the FX line.
There is significant IP tied up between NV and AMD , but also a dozen other companies.
Due to that and other reason Intel tried a different approach that was more compute focused than dedicated logic in hardware. This was just not competitive