I'm reading several articles on planning IP addressing for AKS K8S cluster when using Azure CNI such as this one. They all describe the risk of IP exhaustion and recommend reducing maximum pods per node down to 30. The examples all seem to show CIDR examples such as /21.

My question is, why not just use a large subnet such as /16? Wouldn't 65,536 ip address be more than enough for most scenarios for IP exhaustion to not be a concern? What am I missing?