Several years ago, I dropped almost all of our commands.
Bottom line, if we don't use it on a daily basis or in the show, we don't spend time there.
Parade Rest is still in play, so we have a place to be while we wait for a judge to find their pencil/recorder/etc. or in the event of another time we need to "hold".
"Set" brings us to attention.
Band Halt Band (stick, stop) is still used.
Everything else is metronome/or visually based.
I give them a series of instructions and we execute those, with a bit of assistance over the microphone at first, and then less as we progress. This allows them to focus more on technique and execution and less on listening for a command.
I realize that there are plenty of programs that still use a multitude of commands, but we aren't one of them. What I have seen is many directors DRILLING those facing movements, etc. and then never using them again past summer rehearsals. You can clean movement and execution without the commands by breaking things down.