Whether it's called "condition of employment" or "a perk" the effect on other employees' morale can be the same. Other employees can, correctly or not, see themselves as busting their ass while Joe gets to slack off.

> Further I would never lead based upon reducing resentment

You give an example where an entire group is working well, and a single person is mad. That is not a good counterpoint against the theory that you should take action if one person is happy and many others are unhappy.

I'll say again (although I shouldn't need to) that I don't know if this was the situation at Yahoo.