I get why they moved to TRX40 for a proper multi-generational platform, but I don't think they fully anticipated just how much demand EPYC would have and just couldn't commit the chiplets to make Threadripper as well. And with Intel continually shatting the bed with Sapphire Rapids, there was no financial incentive for AMD to take the hit on EPYC.
Hopefully this out of the blue announcement marks a re-commitment to HEDT. Start over (again), PCIe 5 and DDR5, fresh platform that can also take Pro CPUs and knock out a couple generations of Threadripper. Because I don't see Granite Rapids being anywhere good enough to warrant a knee-jerk response from AMD, if indeed this is just a knee-jerk response.