I can unconfirm that this happens to everyone. My reddit account was created 4 years ago, with unconfirmed email for a long time and my posts were seen immediately. Maybe it depends on what subreddits you post to?
Things may have changed in 4 years. I only encountered this problem when trying to create a new account a few weeks ago. I had to download the app and use my Google account to make it work. (Not denying anybodys experiences, but these unwritten rules are really a bad pattern from reddit).