Thank you for the constructive feedback and discussion.
We are proceeding with a three month rename interval for now.
We will monitor the situation for its impact and adjust if necessary.
If a technical solution is implemented widely in FAF communication mediums (e.g. similar like discord unique handle), that allows better identification of players, we see no issue with going back to shorter rename periods.
Regarding the rule on similar names, the wording of the rule is as following:
Usernames that impersonate others or are visually identical to other usernames, for example by exploiting visually similar characters, are not allowed.