If you produce [salary]$ worth of value, then it does not really matter how you produce it, right?

I'm not GP, and I'm self-employed, but I think it's fair to compensate people based on the value they create, and not how much time they spend at the office. If a guy gets his work done in half the time, and his employer is happy with the cost, then everyone gets what they want.

I am employed at-will and I have yearly written proof that my employer is happy with my work.