We have always encouraged our owners/residents to go via the SM with any issues that needed attending too. The SM is there 5 days a week, 9-5, to handle any correspondence and to attend to anything of urgency. Members of your EC probably work 5 days a week, 9-5, so are not there to attend to correspondence from the complex every single day!
We had instances here where owners left a note under the door of a committee member. There is no record, its not official, and when it gets stuck under the door mat, its not seen! And sending email to EC members directly, well alot of people do not necessarily check their email each and every day.
By sending correspondence to the SM, there is a more official “paper” trail. The SM should note the correspondence, can attend to matters that need immediate attention themselves (safety usually) and can advise the EC of an issue that needs their attention/decision. The SM can then follow up and ask for a reply.