Also, they don't GA anything without a good reason. Introducing a new socket is not trivial - all their FCLGA3647 boxes introduced in 2017 can be updated to second generation ones introduced this year - or they can just build these machines without having to redesign the motherboards.

Introducing EPYC Rome boxes would require, besides a volume price agreement (that AMD could be reluctant to enter, as they can sell the whole capacity with better margins, at least for now) new supply chains for motherboards and PCIe 4 peripherals that can't be used with their Intel stuff yet. That's a lot of disruption.