Down10, "We’ve redesigned and modernized the core experience to be cleaner, more inviting, and easier to use."

That's very much subjective and doesn't look like a real problem needing a solution nearly as drastic as making a new UI from scratch. I'm pretty sure the old UI was "easy to use" enough. I mean it's a web browser. Everyone knows how to use one. "Cleaner" is the plague that has infected many UIs these days. Yeah sure just hide everything 10 levels deep into menus, it'll be fine. Then remove those features altogether because "no one was using them". "More inviting" is straight up marketing bullshit.