There are potentially quite a few benefits of being able to spin up clusters on demand [1]:

* Fully reproducible cluster builds and deployments.

* The type of cluster (can be) an implementation detail, making it easy to move between e.g Minikube, Kops, EKS, etc. After all, K8s is just a runtime.

* Developers can create temporary dev environments or replicas of other clusters

* Promote code through multiple environments from local Minikube clusters to cloud environments

* Version your applications and dependent infrastructure code together

* Simplify upgrades by launching a brand new cluster, migrating traffic and tearing the old one down (blue/green)

* Test in-place upgrades by launching a replica of an existing cluster to test the upgrade before repeating it in production

* Increase agility by making it easier to rearchitect your systems - if you have a pet, modifying the overall architecture can be painful

* Frequently test your disaster recovery processes as a by-product for no extra effort (sans data)

* Reduced blast radius

[1] https://docs.sugarkube.io/#benefits-of-sugarkube