However, does anyone have experience with obtaining RISC-V server hardware on a commercially useful scale, i.e. more than 1pcs? Back when ARM servers where all the rage, there were lots of announcements, but almost never products one could order. Is RISC-V any better in that regard?
I'd note that ARM servers are finally becoming competitive in specific use-cases. The AWS Graviton2 CPU is useful for many apps.
Of course in "a few datacenters full of"-like quantities there was just no chance of getting anything. And of course, for making our own hardware (you can get ARM chips, just not full systems) we don't have the expertise, size and will.