I don't think its an argument. I think people are stating whether they would let someone who is high belay them or not. And I don't think anyone has said anything against actually climbing high or any rules. But my climbing code includes that I try to mitigate whatever risks I find unacceptable. In my book, that includes me letting myself be belayed by someone who is high. There is no room to argue there. Furthermore, I would be totally fine with someone who told me that they didn't want me to belay them b/c I was not high. Whatever works for you.