Oh boy, this must be the overstatement of the decade. I've done SSR with a few frameworks now, including Meteor, Nest, and Next. Saying that "it works out of the box" is so disingenuous, it borders on fake news. Even ignoring the trillion edge cases involving authentication, cookies, localstorage, dynamic components, promises/futures, async components, and so on, it will take dozens of man-hours to get properly-rendered server output that works with server-side routing, hydration and looks good on Google's SEO crawlers.