#2 Braun is really unlikable (in a good way) as a heel
Braun Strowman proved at the start of his career that he can be a fantastic heel. One of the most significant reasons to turn Strowman heel is the simple fact that he is too good at it.
The Monster Among Men has everything it needs to be a bad guy. He's a decent worker on the mic and can cut cheesy promos to annoy the crowd. Strowman can even work as a meaner heel on the mic. He is a big, scary, bearded monster.
Not only does his appearance help him to be the bad guy, but his in-ring work also helps him. Strowman is a very dominant force inside the squared circle. He's a raging bull with unbelievable speed, who runs through his opponents like a bullet train.
There's no doubt that whenever he steps inside the ring his opponents feel threatened by his physically imposing aura. Strowman's wrestling style is scary. You never know when he'll rip apart his opponents limbs by the impressive mixture of his power and speed.
Braun Strowman hasn't destroyed lately. Bringing back his heel persona will in turn bring back the destructive Monster Among Men, which actually got him over in the first place.