A lot of non-developers that use some cobbled together amalgam of tutorial code pasted into wordpress themes never have any performance problems with their site. If people are using these things for their own personal projects, then who cares. If they're posing them as in industrial tool, someone with a better vantage point should probably tell them they're about to step in shit.
Different people have different use cases. Many people-- support, customer service, incident response, etc. need to be able to parse those screens incredibly quickly all day long. The small amounts of time that people spend visually orienting themselves on these pages not only takes up time, it unnecessarily imposes a cognitive load. While you could have a code editor that used the glyphs, cursor, and layout of a word processor, and a low-volume coder might not even care, for most developers, it would just be exhausting to visually parse all day long. For many people, communication tools are essentially their code editors and their work is often far more time sensitive than a developer's.