But why are we still seeing a surge of server-side rendered websites claiming to be on the Jamstack?
Don't judge a book (this paragraph) by it's cover (the above heading). SEO is not runing the web. But it isn't making it easy for the Jamstack, which happens to be improving the web.
Let's go back to the basics of a webpage and how browsers read them: A search engine's bots visit a page and makes a decision about it based on it's HTML content (amongst other things).
If you want to stay true to the Jamstack and avoid server-side rendering then you need to tick all other boxes to enrich your website and have good SERP rankings. This isn't a post on SEO, but these are the base standards you should be adopting when building a Jamstack website.
robots meta tag with
index, follow as the content will ensure the robots are going to take note of your page. Most site generators will provide this out of the box but it's extremely important that you check this out.
In short, structured data is a JSON object that you add to your HTML with further details about the page. It lets the search engines better understand what the page is about so they can make decisions on appearance and ranking. The properties you add are relative to the type of content, so use schema.org's documentation for reference.
I'll work on a future post on all performance enhancing factors and why you should adopt a new mindset when building your pages.