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I think most people just have some sort of real IPAM, whether that’s a DHCP server that supports stable reservations, or something else. Managing self-assigning your own static IPs isn’t something I see many folks struggling with.

Fair enough. Organizationally we're looking to modernize IPAM and change how we do DHCP on prem so I was just looking to see if this is "good enough" to hold on us over until we have something more mature in place.

Not sure on your infrastructure setup, but looks like you are using vSphere as the cloud provider. If so you can take a look at using vSphere Network Protocol Profiles in combination with vApp properties and cloud-init to configure a static IP to a VM using a /24 for a given vSphere network. See for example this blog https://www.virtualthoughts.co.uk/2020/03/29/rancher-vsphere-network-protocol-profiles-and-static-ip-addresses-for-k8s-nodes/ and github repo: https://github.com/frank-at-suse/vsphere_rancher_cluster?tab=readme-ov-file#static-ip-addressing