This isn't my experience at all, LLMs do graphs and more complex excel-like web pages very well. They also do dashboards very well. They even seem to do 3D stuff with three.js like video games pretty well too, although I haven't tried that myself. Maybe they can't do something "great", but they sure can do good enough in most cases, and good enough is already better than most websites.

>I'm not a frontend dev, but these statements are starting to get outright disrespectful to those that are.

Agree here, especially considering that usually "niche scientific codebases" have terrible code so you don't need a super smart model to get a good bost in software engineering.