There are employers who make rules like that. If you want to be part of an organisation and they have a rule like that, you have to follow the rule.
True. Employers, especially large, in the public eye, ones, have specific grooming rules for employees. If you want to work there, then you have to follow the rule.
But, as mentioned, you can always quit your job at that company and find another one in a similar position, or even something better. Not so in Watchtower World. The catch at this company is that without them, you will be destroyed, along with all the evil people, at Armageddon. So, basically it boils down to, 'obey and shave - live; or disobey, grow a beard - die'. That's a simplistic equation, but that's how it's presented, so that's how you have to accept it.
True story: when I was first waking up to the lies of the WTS, I had sheparding calls from elders. In these calls, I questioned some WTS rules that aren't biblical. Beards was one of them. One elder mentioned a large US company that had similar grooming rules, as they wanted their employees to represent them in a certain way, similarly for JWs. They should want to represent the organization in a good way. That's when it hit me - we weren't representing Jehovah, able to use Christian Freedom in our day to day lives, we were representing the WTS as door to door magazine sales reps, and had to obey company rules.