And that's what most of the web needs - few use cases require having to manipulate every bit of the dom to send constant updates to the end-user. Social networks, financial sites, banks, betting sites etc. The rest do not need these heavy frameworks and the extensive dom manipulating capability. The last thing you want in an ecommerce checkout process is to distract the user by manipulating the dom to give him 'updates'. So nobody does anything like updating the user with info like 'latest prices', 'your friend just bought this' etc right in the middle of the checkout process. Same goes for blogs, most of publishing.
