I try not to draw conclusions from that scene, because Abrams has shown a profound lack of understanding about the scale of interplanetary and interstellar space. The destruction of the Hosnian System shouldn’t have been visible from Takonada, even if it was the next system over.
And of one looks at the map, the distance between Takonada and the Hosnian System is around ¼ of the diameter of the galaxy!
It was built on a planet, so it’s anyone’s guess what degree of mobility that thing had when it came to aiming.
Probably for the same reason Han was able to get the drop on Vader during the trench run to destroy the first Death Star. He was completely focused on something else, both with his regular senses and the Force.
The haircut is an unfortunate necessity to hide his freakishly ginormous ears.