Why not?
Miz finally gets to win the big one since his win against Cena at Wm long ago and Bryan is able to beat his greatest foe for a title that he's been clamoring for since his return from retirement. Adds up pretty well.
Like I said, the match doesn't NEED the belt to be good, or for the build to suddenly matter more. They've got three years of animosity saved up between the two.
Meanwhile, Rusev just won his first EVER WWE title opportunity.