Not having them find out who Vigilante is would definitely be a big change from that pattern.
Masked individuals and mysterious bad guys aren’t generally able to keep their identities a big secret for longer than a one season in the Arrow-verse.
Between Felicity’s hacking skills and Oliver’s interrogation skills on the street, the team usually manages to figure out who everyone is before too long, and they often get the details on where or how to find them when they want, as well.
While it’s certainly good to know that the team behind the scenes at Arrow has a handle on who Vigilante is, it’s disappointing to hear Marc Guggenheim tell Entertainment Weekly that we, likely, will not be privy to that answer by the time Season 5 ends.