When the multiplayer "Reduced Debug Info" option is set to "On", most of the useful information (heading, co-ordinates, and lighting levels) are hidden, leaving information that isn't very useful to ops and in-game useage.

I'm sure the data set it does provide is useful to someone, but having a different reduced debug info set that is more useful to ops on a multiplayer server (such as ops that need co-ordinates to be able to report things to other ops, set up teleporters and command blocks, etc) could be beneficial.