If it's made of different elements, then it's not consistent. White checkboxes, white dropdown menus, white panels, white mega buttons, it's all sticking out of purple interface like sore thumbs. All 345 of them on one left foot. Sure, their whiteness is certainly consistent across the board, but it's clashing with the very foundation of the new GUI theme. It feels like sticking Windows 9x styled menus into Windows 7 or Windows 10. It just doesn't compute.
Then there are flip switches where some are round and some are rectangular. And if you open a main GUI and "Settings" panel and bloody close and Help (?) buttons don't even match. They look somewhat the same, but they are of different size. And there are hundreds of such examples and when you have hundreds of things that just don't match together, the overall feel will NEVER be good. It doesn't feel good.
I honestly don't care if avast!'s GUI remains absolutely the same through several years and you just change the year number on it. If it's good to begin with. But that's just not the case. It's always "That'll do" and "We'll fix it later" and it never becomes good. And you keep fiddling with it in all wrong ways.
Want to know what's a good interface in my "design" book? Kaspersky 2017. I suggest you guys install it and see what I mean. It's beautiful, consistent, logically laid out, well organized, not cluttered, it's everything avast!'s new interface isn't.