Why use StatefulSet for geonode, geoserver, and pycsw?

[weeix]

Hello,

I’m currently learning Kubernetes and I’ve come across something in this repository that differs from what I’ve previously read. While rabbitmq, postgresql, and memcached, use some kind of leader/follower topology, which makes sense for using StatefulSet. Isn't Deployment enough for geonode, geoserver, and pycsw?

Thanks!