@russian-dima Not only responsiveness. Also element positions such as “fixed” and “sticky” (there’s no sticky position on the classic editor, and the fixed position - pin-to-screen is limited to desktop view on the classic editor unlike EditorX.
Anyway responsiveness and having a full-width display is not a minor benefit.
Anyone who wants to have a modern design and not an old fashion design (of 5 years ago) will prefer EditorX.