Faster response to user actions, smaller payload, not reloading the whole page, keeping scrolling position, keeping focus and keyboard cursor position when poss

Faster response to user actions, smaller payload, not reloading the whole page, keeping scrolling position, keeping focus and keyboard cursor position when possible, allowing transitions and animations, no need to change browser history unless necessary, very minimal javascript necessary, allowing user to disable javascript in some cases. Just because this is a counterexample to something that you deem good, it doesn't mean it has to be absolute shit. The world is not black and white. I would suggest at least doing some research about how things work before criticising them. They might surprise you.