In many cases you're right, in others (understaffed, multiple difficult tables, etc) I always felt like it would be a courtesy to the server (who is likely doin

In many cases you're right, in others (understaffed, multiple difficult tables, etc) I always felt like it would be a courtesy to the server (who is likely doing 10 things at once) to be able to request their attention without immediately demanding their attention / interrupting what they're already doing.