There are definitely good reasons for not linking an AresMUSH handle to your account–there are creepers and assholes and rumormongers aplenty in our little hobby.
So I agree that no one is beholden to creating a last handle that goes beyond games, someone else’s safety is more important than my comfort.
But I will admit that I feel a great deal more comfortable when I recognize the handle of staff on a game and I know who I’m dealing with. It allows me to start out in a place of trust (or to avoid the game entirely if it’s someone I’ve had a bad run-in with in the past). If they have a handle that I don’t recognize, I will start out in a place of neither trust nor distrust. There should always be room for new folks to come into the hobby and start up a game, but for me at least, it always makes me feel a little better to recognize a handle that I know and trust on the staff list.
I also think that staff should always have their player bits linked to their staff bit. As others have pointed out, there’s a power imbalance there, and unless it’s recognized and called out, it can get treacherous. Sure, it can be nice to go “off duty” and pretend to not be a staffer for a while playing a “hidden alt,” but it’s also disingenuous, because you are a staffer, and you’re seeing things through staffer eyes the whole time, and can bring in the weight of staff whenever you want (either through yourself or one of your fellow staffers).