To me the problem with openstack is a strategic one. The Project tries to automate status qou putting the compatibility burden on the automation. PaaS alternative like Kubernetes on the other hand turns this on its head and puts the burden on the komponents of the applications. This is a much better long term strategy for keeping komplexity curbed.

Also openstack was open for fake vendor openness. Where vendors could make compatible api with extensions. This doesn’t help the system integrator in the long run.