Here at Sidero Labs, we love https://github.com/kubernetes-sigs/cluster-api (CAPI). Not to mention testing Talos Linux with CAPI several times a day.
Building outside of CAPI allows us to leverage these upgrade APIs we already have, and avoid the rolling updates limitations CAPI imposes.
Sidero Labs will still very much be part of the CAPI community and all of our providers will continue to be maintained and improved.
Nokia will be discussing “Scaling a Private Cloud Managed Kubernetes Service to 100k+ Cores,” using CAPI, Talos Linux and Sidero Metal.