These numbers aren't all that far off. Night Fae's travel form is inherently GOOD for casual players. Necrolord's abilities plain SUCK. Beyond Necrolord lagging behind the overall numbers are much more even.
Now if you look at the spec-level... there are clear winners. But again, it doesn't take a genius or someone reading min/max guides folks... you get to use these abilities for your class in each of the zones. Night Fae on my mage I was using over and over to reset Fire Blast in the quest area. Turns out that means it is beast... that isn't rocket science. That didn't take me reading an essay from Complexity Limit or analyze sim spreadsheets. It is clear as day. I never used the Kyrian or Necro class ability once because it sounded so stupid and slowed down how I play. I used Kyrian a few times but it felt dumb.
As to "covenant class fantasy" whatever. You spend like 5-10 minutes a day in the faction hub. The rest is in Oribos or doing the WQs and you can travel all over and do those regardless of which Covenant you chose.