> Even better, don't pre-render anything until the first time it's requested, then render, serve, and cache it.

This is essentially what Incremental Static Regeneration (ISR) does.

But, mostly you pre-render it, because else, the first user has to wait to long for the page. ISR is also re-rendering for the next user. The current user has the old version and the page is re-rendering in the background for the next user.

The JAMstack architecture is advantageous because it allows for the use of simple servers—essentially S3 buckets that can serve static files. This setup requires less security patching and reduces costs for server hardware. Additionally, the server essentially acts as your cache, allowing you to distribute it widely.