I did not know this, though, I'd be lying if I said I didn't expect it.Joss has daddy issues, and ultimately, as long as Giles was Buffy's father figure, he was eventually going to turn him into Hank. It's absolutely ridiculous, season 6 was largely about a girl needing a father, a mother and a mentor. But Season 7 was about Girl power. And Joss did reconcile with his own Father prior to the man's death.
This is one of those rare times when I get taken out of the story's world and realize that everyone is sort of one person, the creator. Ideally, we shouldn't see this or realize it. Part of the fun of entertainment is imagining that a world created purely out of the mind of one creator, or the minds of a handful of creators, is in fact a real world with unpredictable circumstances and people, where anything can happen. Because there was a team involved, they were able to keep surprises coming, but if I can fault Season 7 for anything, it's in letting down that illusion in some places.
One could argue Giles's behavior is a natural progression, that Buffy's behavior is a natural progression, that Willow's and Dawn's and Faith's, so-forth and so-on, are all just natural progressions of their characters growing against each other over seven seasons. However, that progression all seems to take a similar turn towards the last seasons. Nearly every character is starting to look a bit too battle hardened and cynical.
We could say, of course they are cold, cynical, and battle hardened, they've literally been battling for seven seasons, but not every person responds the same to stress or any other outside influence. One could counter that because they are all so friendly with each other this probably points to their deep seated similarities as friends, and therefore, their responses to seven seasons of fighting are remarkably similar. Sure...but what about Kennedy, Rona, and Wood? They haven't been there for seven seasons, yet we get the same brand of cold cynicism and battle hardened attitudes. Sure, there are a few new characters who aren't this way, but how much screen time do they get and how memorable are they? Not much. There was an attitude that Joss endowed the entire show with in season 7, and it wasn't always to the show's benefit.
I could argue for Giles here and the writing, but I'd rather not. It doesn't take away my appreciation of the show, but it makes me thankful that it ended when it did, so we didn't get any more of this.