If notices are sent by email they are sent with the email addresses in the bcc address line, so no-one can see them. In large blocks you can also send a link to the notice on a website. So no email addresses are disclosed.
I can see why it can seem EC members are hiding, but the conduit for communications is the strata manager – that is their job. As an EC member I do not want emails or phone calls. In a building of 100 that would be a nightmare. In some cases where EC members really are running the property then it would be reasonable to require that their contact details be available.