Tuleap relies on BCrypt for more than 6 years now but when introduced it we had to manage the existing password storage scheme.
It is time to let it go, if we still have passwords stored in old format users will not be able to log in (they will need to use the password reset procedure) but it also means that they have not logged in once in the last years (password storage would have been upgraded otherwise). Keeping support for this old storage format is not safe if the DB gets breached and user have re-used their password somewhere else.