Thanks for your feedback.
The real difference in the improved sign up is not how it affects the students, but how new teachers are now able to instantly create their account and sign into the app. This was not the case before. There's also a clearer distinctiin now between creating a student account and a teacher account.
You're right, students will still need a class code in order to enter a class. The main difference there is that they can now create their account before entering the class code rather than the other way around. I have slightly modified the post to hopefully make this a little clearer.
The EF Class Team