Thank you for an excellent post on Crossplane usage in real life! This piece of technology is just starting its way to production systems, but it's definitely a great way to manage application infrastructure.
As far as I understand, use cases for Crossplane - it supposed to be used together with CD systems, such as ArgoCD. ArgoCD on its own add quite a lot of CRDs to cluster, so the problem highlighted in the article is very relevant to heavy used clusters