Why would you need the roster if you've only ever done walk-ins and walked out plenty of times? Just walk-in...
Just because I walk in and walk out doesn’t mean I don’t like to know who’s working. Like if I know one of my faves is working, I’ll try and make time that day to pop by. If there are some duds I’ll avoid.
Same reason we do ARs and communicate. Knowledge is power bro.