As part of T348388: Use central login wiki for login (SUL3), the login and signup forms would be moved to the central login wiki. It would make sense to move the credentials change forms (password change, 2FA change) as well. This doesn't block rollout of the other SUL3 work, and could be done much later, apart from WebAuthn where we'd have to disable the local form at least (T354701: Migrate WebAuthn credentials to loginwiki).

In the simplest form, this could just mean changing the various Special:Preferences buttons to be simple links.