Yes it is about the end user. They don't care about your backend code. They want it to work and for it to perform. Your cleaner code means nothing to the user.

Yes it is about the end user. They don't care about your backend code. They want it to work and for it to perform. Your cleaner code means nothing to the user. Sometimes you have to put more time into frontend and you're up against a tight deadline. I'd opt for the UX in most circumstances. You're assuming that there are colleagues to work on it and that it will live indefinitely. Many projects, esp. those related to marketing, have a definite lifetime. You also mention prototypes as another use-case. Cleaner code as directed by the article is not always necessary.