Moving the tail farther aft gives it more aerodynamic "presence" (or power). It's aerodynamic force gets more leverage so to speak. Which is good because the CG is now centered farther aft, and no mention has been made of moving the wing every so slightly aft to keep the CG location positioned in the appropriate place relative to that wing and where it's effects are felt.

As for flying wings.... they absolutely do have pitching moments that need to be controlled. They don't happen to conventional tails, but absolutely do require pitch control. That's why they have "elevators", or surfaces that do elevator functions. And those things have dismal leverage, btw. And they have damn narrow range for their CG to be positioned.