Discipline seems pretty central to the story of Gilneans and all "in control" Worgens. Most need the help of "magic" to manage curse but some can do it with out the ritual. It is also implied that a post-ritual worgen can still be unable to take Human form if they lose control of their rage/curse. Though I don't think it is explicitly stated that could happen.
So while it is possible to have a group that doesn't use the ritual it seems like a plot hole to not have them take the ritual once "integrated" with Druids and Alliance.
https://wowpedia.fandom.com/wiki/Ritual_of_Balance
https://wowpedia.fandom.com/wiki/Nei...uman_Nor_Beast