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I thought he was being rather reasonable.

Being reasonable includes having logic as well. Is it hard to take care of this hordes? Yes, as he said: it is. Then it is a DIFFICULTY issue and if you can't take it, play a casual, Easy mode. Don'
t even dare to play Normal/Hard, it is not for you.
Simple logic.

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I shouldn't have to lower the difficulty to easy

Yes, you should. That's the whole point. Lower diff - less problems.