#1 Long Term Storylines
Nowadays Vince McMahon changes his mind all of the time which means no long term booking can be done apart from picking two people to face each other at WrestleMania a year before it happens.
As seen in NXT with the Johnny Gargano vs Tommaso Ciampa storyline which has lasted over a year and a half and is still continuing and fans are still into it. Different Bookers do things in different ways. For example, Gedo, New Japan Pro Wrestling's booker lays everything he wants to do out well in advance so that every match makes sense.
This rarely happens in WWE today but Hunter taking over could lead to long term stories that actually make sense and pay off well as opposed to booking a week to week and not having a long term goal. But hey, let's just hope Triple H doesn't let us down because we have high expectations.