The Editor is where most of the action happens in WordPress’s daily use, and it was a place where we could polish and perfect the block experience in a contained environment.
Additionally, the classic Editor was built primarily for text — articles have become increasingly multimedia, with social media embeds, maps, contact forms, photo collages, videos, and GIFs. It was time for a design paradigm that allowed us to move past the messy patchwork of shortcodes and text.
The Editor is just the start. In upcoming phases blocks will become a fundamental part of entire site templates and designs. It’s currently a struggle to use the Customizer and figure out how to edit sections like menus, headers, and footers. With blocks, people will be able to edit and manipulate everything on their site without having to understand where WordPress hides everything behind the scenes.