Most people I know have had an issue where they misunderstood what an object in a YAML file is (and therefore did not apply a configuration) or something similar.

Bonus points for mis-editing a kube object (kubectl edit) that you save correctly only to realize that mis-formatted YAML can get thrown away without reporting an error back (looking at you Istio).

And yet people choose it again and again for new projects. Someone must love it given the popularity...