Why would you create a new language and then keep a huge part of what developers interact with on a daily basis in such a broken shape as in Java? (Or rack up a

Why would you create a new language and then keep a huge part of what developers interact with on a daily basis in such a broken shape as in Java? (Or rack up a massive amount of complexity and break your typesystem by trying to put lipstick on the Java collection pig? (Kotlin).)