Additionally, the new user interface has default settings ideal for a majority of users, with expertmode control options for enthusiasts and power users.
It used to be common practice in software to offer what was called an "expert mode" that simplified interfaces and allowed users to employ shortcuts to get what they needed.
"Medium" on guitar and drums with the Beatles also seems easier than "medium" on "Rock Band, " while "hard" was sometimes just challenging enough for people who had played many times before, with "expert" mode still perhaps beyond reach.