Just speaking another language is not enough. You must of course be perfectly fluent to speak, read and write in both languages.
You must also have knowledge of the subject matter terminology, vocabulary, terms and phrases.
To convey meaning accurately requires in-depth familiarity with a language and its cultural background.
And finally, interpreting demands utmost concentration – something that is trained for through years of practice.
“Simultaneous” means right now, live, as it happens. And that requires a special skill, in addition to language proficiency as such.
After all – you don’t just let anyone with a driver’s license race a formula 1 car…
