You are viewing this in a much too simplistic manner. It doesn't matter what kind of category the trait has.
What matters is what the trait is giving you in terms of economy. All traits convert to economy somehow.
Being stronger in combat means you can take more fights, which means you can clear more of the map.
Healing faster also means you can take more fights, just like movement. It all translates into economy.
Economy is the driving force behind this game, everything comes back down to Production/Gold/Knowledge.
Mana is less important because you simply can't do as much with it as you can with the other 3 resources.
Food and Draft are even worse, as Draft is situationally required and Food just has very poor scaling.
So what does Fabled Hunters do?
- It grants you 5 HP regeneration, and a Ranged unit which means you can clear the map better.
- It grants you +75% resources from clearing Resource Nodes, Ancient Wonders and Infestations.
What are you doing the entire time you play the game? You're clearing the map as much as possible.
Clearing the map grants XP and rewards, rewards grant economy, economy grants more/stronger units.
It also grants you more cities, or rather bigger and better cities. Which again translates to army power.
Knowledge/Gold/Mana/Production/Food/Draft all translate to more/better armies in one way or another.
I'll also mention Imperium as Ancient Wonders can grant this as a reward, and it will be multiplied too.
All the competitive players spend every single turn clearing multiple independent armies on the map.
These can be Resource Nodes, Ancient Wonders, Magic Materials, Infestations or Guarded Pickups.
If you do the math for what +75% rewards means, multiplied by fights taken per turn, you'll understand.
The amount of raw resources you get is huge. No other trait can match this power, not a single one.
Even if the trait becomes a bit weaker late game, it's all about the snowball. Kick-starting your economy.
Try playing a match with any other trait, you'll notice a big difference in your economy and power.