I did experiments like this in 2018 when I worked at Zillow. This tracks with our findings then, with a big caveat: it gets weird at scale. If you have a very large number of pages (hundreds of thousands or millions) Google doesn’t just give you limitless crawl and indexing. We had js content waiting days after scraping to make it to the index.
Also, competition. In a highly competitive seo environment like US real estate, we were constantly competing with 3 or 4 other well-funded and motivated companies. A couple times we tried going dynamic first with a page we lost rankings. Maybe it’s because fcp was later? I don’t know. Because we ripped it all out and did it server side. We did use NextJs when rebuilding trulia but it’s self hosted and only uses ssr.
Also, competition. In a highly competitive seo environment like US real estate, we were constantly competing with 3 or 4 other well-funded and motivated companies. A couple times we tried going dynamic first with a page we lost rankings. Maybe it’s because fcp was later? I don’t know. Because we ripped it all out and did it server side. We did use NextJs when rebuilding trulia but it’s self hosted and only uses ssr.