Your words… 
The official catalogue is managed by iXsystems, as were CORE plugins. Your woes were probably related to it being limited to port 9000 and above (so no port 53 for DNS).
TrueCharts is managed by another organisation, uses more advanced Helm configuration to make stadard ports available, but tends to break at each major TrueNAS release.
If you want to stay with SCALE, I suggest you look into jailmaker.