Why are you so afraid to GF Hakumen. That 5A loses to all of his drives is a moot point, because realistically he is only going to use 2D which also beats 5B. 6B does not have good recovery on a whiff and loses in any situation where the Hakumen didn't press 2D or block low. Actually, if 6A after GF is considered a bad option, 6B must be even worse because it's slower and doesn't get super armor. And if you think he's going to sit around long enough for the 6B to connect, you could easily just 360 him, which is faster, lands regardless if he's mashing drive or blocking, does more damage, and is unburstable. I wouldn't consider using 6B even in a block string, let alone after GF oki.
Look at this way, a character like Ragna has better options after GF than Hakumen does, and he still eats plenty of 5As and 360s. Even if a character has a reversal, they might be too scared to use it if you know how to shut it down. And some of them will be looking for your attempts to bait them, which opens them up to 5As and 360s again. It goes back and forth.
Not using GF on Tager however, I will agree. Fuck that shit.