I'll tell you flat out.Tell me, because I've never quite understood, what's the appeal of 'cannon fodder' style enemies?
Cannon fodder, if ignored or understimated, becomes a dangerous element, especially when spotted with stronger enemies.
For example. Castra Novum. A good number of the monsters there can be killed with ease, but if you sit and do so, you'll be trapped in a never ending battle with spawn rates wearing down your healers until you eventually succumb and die due to lack of fight control.
Pair that off with the fact that you really have to pay attention to the big guys spattered among them and you've got a fight on your hands.
Imagine Garuda without her Plumes. Without the cannon fodder providing a constant threat to your protection from her 2hr, that fight would be just a 'tank and spank' which is actually more boring than fighting cannon fodder.
Beyond that? Cannon Fodder is a sense of empowerment of your character. You are better than the average mob, about equal to the uncommon mobs, and need to team up with friends to fight the superior mobs.
Now there are ways to make things more challenging, but following Roiken's suggestion and making field monsters harder is not the answer - and actually expresses a lack of exploration of the game on his end. If you go to any of the Beastmen strongholds or Castra Novum, you will see the dynamic fighting style I have just described. Those fights are not boring or unsatasfying, if you're not careful, they can be quite dangerous, especially Castra Novum. Granted, some areas could use a bit more spotting of the stronger version to balance things out, but people will usually go the path of least resistance, buy and large, so some areas where you can kill Cannon Fodder only will be desired to remain as is.
So no, your analogy is very far off the marker, really as there's a huge difference between describing the fights on paper and actually participating.
I agree that Grinding shoulden't be a wall to endgame, but that is also an argument for faster leveling, because any repeatable content that is not endgame that does not get reused for endgame, will die off and become failed resources.
In the meanwhile, Leves, Quests, Storyline all keep the 'grind' more interesting as you level up faster.