CAPZ supports LB outbound type only for private clusters (using another method, perhaps nat gateways for public clusters): 

https://capz.sigs.k8s.io/topics/control-plane-outbound-lb

• We need to change our default outbound type, to CAPZ's default (confirm default is nat gw). 
• Validate that LB outbound type can only be used for internal clusters, which is technically a breaking change but a desirable one.
• Need to gather requirements for UserDefinedRouting