Doing otherwise will, at some point, make your Plex experience more difficult.
Dashes, periods, underscores, etc do not help. At best, they do not harm, but why tempt fate?
The year helps with matching. It takes no extra time to add the year, especially if using s/w such as FileBot. Think of it as future proofing against remakes and movies with similar names.
Good post with details on how Plex matches things:
