#2 To allow Superstars some creative freedom
One thing that is a problem in WWE, is having no creative freedom or control of your character. Some wrestlers have left the company for not having creative freedom. Only super talented WWE performers, who management have their trust in, are allowed to show us their creative abilities.
With most WWE talent, they are expected to read promos that are written by creative either in full or in bullet points. While it helps those who aren't good on the mic, it can also damage their character for sounding unauthentic and rehearsed. It also exposes the environment backstage to a certain degree, with how WWE wants their talent to appear on camera for us and how controlling Vince is.
Having everything written on a script is very poor from WWE and shows there is no trust in their talent. When you have a character, you usually would like to have some freedom to better connect with fans. With how things are in WWE, very few talents are connecting with the fans because their characters aren't very authentic or relatable. They are very gimmicky and laiden with poor promos or segments written by creative.
It can also be their in-ring style that might not connect with fans. Someone like Roman Reigns is positioned as the Superman of WWE, even using the Superman Punch as a signature move. These sort of characters may be popular with younger fans but it doesn't come across as relatable to the older fans.
People aren't nieve about the business anymore with the internet around. Moves like the Superman Punch or a Hulk Hogan Leg Drop look very basic and uninteresting if you are a hardcore fan. You need to have a relatable character with a move set that fits what their character is about. Being presented as a superhero doesn't work in this era of wrestling. This is why creative freedom is essential because you want to connect with the fans in every possible way.