Kestrel is pushing 7 million plaintext requests per second on techempower. And their test rig is certainly not the best you can get these days.
The cloud has ruined our perception of computing hardware. If I have a choice between owning a physical machine in order to meet a performance objective, or building out a 20 node k8 cluster in AWS for some notion of scalability, I am going to shell out for the physical machine and happily drive to the data center to install it myself.
Who would honestly prefer more computers over fewer computers to manage? Even if its in the cloud its still a fucking mess. The entire game of software engineering is about managing complexity. Not creating more of it and making it someone else's problem.