We are currently setting up a Discourse server for our community, where it is supposed to replace a mailinglist as a better and more fine-grained means of official debates within our association.
As all users who have access to the forum are pre-confirmed from another service and mostly know each other from real life, we let users start with TL1, to very quickly advance to TL2.
While we do not have any experience from practice, we fear that an overwhelmed user might accidentally mute someone in their first few days and later miss important notifications. By keeping this option to TL2, we hope to avoid that.
For similar reasons, we have currently disabled the Ignore Users feature, fearing it might create confusion in binding decision processes, even though we are considering to reenable it for TL3 or above.