In a blog post by Glenn Fleishman at Six Colors, he discusses why Apple's Notes app does not support editing in Markdown format, arguing that it is more beneficial for general users to have a WYSIWYG editing interface instead. He emphasizes that Markdown can lead to malformed notes that could confuse users, even those familiar with Markdown, which is why Apple's approach to only allowing import/export and copy/paste supports Markdown but keeps the native editing process simple is appropriate. Overall, he appreciates the recent improvements in Markdown support by Apple, but notes that features are currently limited to macOS.