I hear what you're saying... but I don't agree. What we're seeing in the novels and short stories are typically the biggest events in his life-- a highlight (or lowlight) reel. There's plenty of time in between for Harry to deal with more mundane matters, like laundry, paying bills... or managing time with his daughter. We're not seeing him abandon his responsibilities; in Peace Talks we're shown that when he's required to deal with dangerous situations, he sends his daughter to safety so he can go do his job, and Maggie accepts it. Michael Carpenter often had to do the same thing as a Knight of the Cross, yet he still had down-time with his family (if not as much as he would have liked.) If Michael made it work, Harry should be able to as well.
At some point Harry might need to make a choice between Being There for Maggie and saving the world, and that could be interesting. But if the world is ending, it's a fairly slow-moving apocalypse (so far.) So I think we can have both... until the BAT, when all bets are off. A darker turn of the story at that point would be appropriate, but I don't feel we're there yet. But that's just my take on it, YMMV.