User blog comment:MisterWoodhouse/Evolving with the Web: Keeping Google Happy/@comment-35464321-20210118034658/@comment-1038387-20210118060237

Technically it's not new. It's been around since before Visual Editors. And it's a relatively simple markup to learn.

Visual Editor is a useful tool, but a simple one and not all code is simple - and then it can't handle it.