Thanks @dnutan I had missed that topic.
With that discussion and my experiences, it is suggested that containers - in one iteration or another - are the way to go. They have the ability to add features without adding complexity to the out of the box simplicity of NethServer’s core functionality. The real advantage in any ‘add-ons’ is having a single point/location for management.
follow up edit: I’ve just installed and toyed with pi-hole. While it is ‘prettier’, I prefer Nxfilter. Simple GUI IP address filter bypass is (IMHO) a necessity which pi-hole is missing.