The game currently has 80 lewd scenes, 7 of which are with Hermann, and he becomes a repeatable forced sex partner on 0 willpower days. He's also prominently featured in several quests. I love that you're so invested in Hermann, but I don't think we'll be doing anything else with him any time soon. :)
FWIW, I kind of agree with the guy (though probably not in the way he's thinking). IMO it would make a bit of sense to give Hermann a last repeatable where Aura's not quite as resistant about the whole thing at first, as at a certain point it's almost out of character for Aura (esp. vis her happily getting abused by Roland). It wouldn't necessarily even need to have new CGs, it could be kind of like the difference between Roland 1 and Roland 2.
Of course, I wouldn't say it's a massive point of consideration, just something to mull over?