NOTE: This suggestion is for Confluence Cloud. Using Confluence Server? See the corresponding suggestion.

Hi All,
Thanks for your feedback on this issue. There are a number of reasons we made the change from wiki markup to an XHTML-based editor - You can read a complete explanation CEOs on this page.

We acknowledge that some users need access to the source for various reasons...content portability, fixing formatting errors, personal preference, etc. So we've developed a free Source Editor plugin which can be found on the Atlassian Marketplace

The source format is not Confluence's old, proprietary wiki markup but rather adheres to basic XHTML markup plus some extra models for defining Confluence-specific objects like macros, links, and images. So if you know basic HTML, the format should be familiar to you. You can read about the format here.

Bill Arconati