1) "the best agricultural rotation techniques
include animal rotation (in, e.g., micro-ley farming)."
2) "If they help overall productivity of the land I don't see a problem in eating them, personally."
Good points.
For the first point, humans, of course, are animals.
For the second point, see the first point. (No soilent green references, please!

)
But back to your point one, could you say a be more about 'micro-ley'? That's not a term I'm very familiar with.
For the record, I for one, am not a (transitional) vegan who thinks every last person in the human race has to be vegan.
So I see lots of room for various animals being used for various things. Just not massive herds of grain-and-soy-finished cattle in CAFOs.