Also, Kyubey states their ethics preclude suggesting wishes. So it’s not unreasonable that someone could wish to abolish the entropy limitation. The issue is finding someone at that age who would think to make such a wish themselves.

Who’s to say that finding and harvesting energy from young girls is harder for Kyubey than it is for humans to harvest eggs (or wheat)? What must his perception of time be if he is immortal? Even if a girl takes years to sign a contract, that’s peanuts compared to the time until the eventual heat-death of the universe, which Kyubey and his civilization obviously care about.

Perhaps the parralell between Kyubey’s emotion harvesting and the energy industry goes further. Perhaps loli energy is like fossil fuels, in that the main reason a different energy source isn’t being used is that the infrastructure for loli energy already exists. Changing to another method of harvesting would drain resources from an already existing practice, possibly for long enough that the net gain isn’t enough to do so. Perhaps, again like fossil fuels, the alternate dimension’s energy is not unlimited, and Kyubey will only change to another method of collection once there are no more girls to harvest?

“Perhaps there are more efficient ways to collect energy, but why not take advantage of this one while it lasts? I’ve already started: Why fix what’s not broken? If your species ends because of it, I, like the universe and will be rather indifferent.” ／人◕ ‿‿ ◕人＼

You’re right, of course, that a farm would be more effective than ‘the wild’. But that’s where the statement that Kyubey’s people have been managing human civilization comes from. While they do seem more hands off than optimal, it’s supposedly no accident that humans have managed to reach the top of the food chain, overcome repeated obstacles to their growth and reach a state where the population is continually growing. The fact the aliens really don’t seem to understand things like why human teenage girls are the best source of magical energy (though really it probably has to do with hormones and inexperience) means that they probably weren’t originally aiming their farm at cultivating those specifically but humans in general while they determined what worked. That said, suboptimal, I will grant you.

As for why it’s aliens and magic rather than aliens or magic, I like to think of it as the results of a thought experiment: “if magic existed, and trumped all physical laws, what are some of the high order things it could be used for that would interest people(aliens) that didn’t have it?”

BTW in your dissertation, try reworking the Standard Model to reflect this new information, lol