Just out of curiosity: Have you ever thought of learning COBOL?

I am fairly new to "enterprise" programming, but have some experience with self-study and open source. I'm getting more frustrated by the day because the code quality of our software is appallingly bad: functionality that should be centralised isn't, assumptions about internal structures and functionality of objects are made throughout the code, concerns are not separated, and so on. In my current team, we explicitly disabled SonarQube because "someone would have to fix it and our software wouldn't pass even after a month of work".
While I understand the concerns that companies would rather see new features than "quality improvements", so what? Every time we want to add something, we either have to restructure half the source code or add it in a really horrible way (and get pressured to do it that way).

Is it normal that code quality in companies is so bad?