If it takes 5 API calls to populate your page, do you want to make 5 round-trip responses to where you user is, or 5 within the same datacenter and 1 to your user? If the answer is that it doesn’t make a difference, then you don’t need these tools.
I think that could be a good argument for a BFF, not necessarily for a SSR app. IMO the only times it makes sense to pre-render your app is when initial loading time and/or SEO are of utmost importance.
