It always surprises me when people don't understand that the employee-employer relationship is an adversarial one. Unless you're in a democratic co-op or similar your employer is the enemy and you should never forget that. The correct move is to try to screw them in every legal way at every turn because that is what they are doing to you. Never divulge any information that increases your attack surface, always try to…
No, it's really not.
The entire point of capitalism is free enterprise and freedom of association. The way to apply that to employer / employee relationships is to recognize that you are not a serf bound to a single employer and keep half an eye on your options in case you ever tire of your current relationship.