I politely disagree. I spent maybe 8 hours over a week rightsizing a handful of heavy deployments from a previous team and reduced their peak resource usage by implementing better scaling policies. Before the new scaling policy the service would scale out and new pods would remain idle and ultimately get terminated without ever responding to a request quite frequently.

The service dashboards already existed, all I had to do was a bit of load testing and read the graphs.

It's not too much extra work to make sure you're scaling efficiently.