It's not. Take any simple web app and deploy it into managed GKE with Anthos and you automatically get SLI's and the ability to define SLO's for availability and latency with a nice wizard. Takes a few minutes to setup.
The amount of engineering needed to achieve good SLO monitoring dwarfs the engineering needed to run a simple app so it just never happened. That's no longer the case.
> Only when company is reaching google scale kubernetes make sense.
Also obviously not true given the number of companies deriving value from kubernetes.
Note, I'm a Google Cloud partner.