If you run the whole thing (app + k8s) then I do agree with you that it's more complex and you're likely be better off without it.
But, k8s offers a very good way to split the responsibility of managing the infrastructure and managing the applications that run on top. Many people work in medium to big corporations that have a bunch of people that are in charge of managing the compute infrastructure.
I certainly prefer k8s as an API between me and the infrastructure, as opposed to filing tickets and/or using some ad-hoc and often in-house automation that lets me deploy my stuff in a way that is acceptable for the "infrastructure guys".
But, k8s offers a very good way to split the responsibility of managing the infrastructure and managing the applications that run on top. Many people work in medium to big corporations that have a bunch of people that are in charge of managing the compute infrastructure.
I certainly prefer k8s as an API between me and the infrastructure, as opposed to filing tickets and/or using some ad-hoc and often in-house automation that lets me deploy my stuff in a way that is acceptable for the "infrastructure guys".