I as a customer would like to manage my API server and Ingress certs with the same tool that I am using to manage my application certs (cert-manager)

Cert-manager will go GA in 4.13,  however it is currently limited to manage application certificates.

Customers that also manage their own certificates for the API server and Ingress,  need to still self-manage these. This creates an inconvenience for them they need to follow two different procedures. 

Customers expect that Cert-manager can also be used to manage external endpoint certs (API server and Ingress).