But, we’re not talking about formal titles. We’re talking about job titles. I’ve never heard of someone called “Engineer Jones”, just “Mr. Jones who is an Engineer”.
If you’re a doctor of musical theory but you work in human resources as a clerk and someone asks you for your job title, you don’t say “Doctor Clerk”, you say “Clerk”.
So, if you’re trained as a Civil Engineer but you changed careers and are now writing javascript, are you a Software Engineer, whereas someone with a Computer Science degree can’t claim that title?