>"I've worked on gravitational (gravity / telekube) flavoured K8s distribution designed for on-prem data centre deployment models for the past few years."
This sounds interesting. Can you say what K8S distro this is?
The existing appliance model will continue to be maintained (until upstream EOL it - or when the support agreement ends).
In the meantime, to address the same requirements from customers who wants some control (K8s stack, VMs, networking and storage are theirs), managed K8s' on-prem distribution may be the answer, I'll be exploring EKS Anywhere see how it works and see if it's a viable option to replace the appliance model moving forward.
Open source edition: https://github.com/gravitational/gravity
Note: We have been using its 5.x branch (tracking K8s 1.13.x) for a long time. That's why later on BYO K8s model was introduced ;-)