The only missing piece is direct framework integration (Next, Astro, etc) but at the rate of development I've seen for these projects we'll have that by next week. Then you have an intuitive site builder that operates directly on the page code just like another dev on the team.
One thing Vercel got really right is being able to click on any element in the page for it to become the context of your prompt. That way, you don't have to type "change the top icon inside the third pricing box to red". Also you'll get faster responses because you don't have to feed the AI the entire page / component each time.