You'll find plenty of static generated websites on:
You can see it's used by Facebook, Spotify, Mailchimp, Netflix, Algolia, Netlify, GitHub for blogs, documentation, marketing pages, landing pages, and so on. As long as there's not much user-generated content, the sky is the limit.
You can also see that you can have dynamic pages with this stack: search with Saas like Algolia, or payment with Snipcart. On top of that you can make use of serverless and functions as a service to run your functions in the cloud - AWS lambda, Google Cloud functions, Azure functions, etc. — for a very low price, as you only pay for execution time. It's much cheaper than having to maintain your own infrastructure.
In a web of services, with APIs ruling the software world, decoupled architecture make very much sense. They're efficient, faster, cheaper, and scale much better.
Content managers can rely on headless CMS or Content as a service platforms like Prismic.io or Contentful.
Basically you build your websites like you build your apps, except you don't manage any servers, you focus on shipping value to the users.
It's not just a trend, it's how the web works nowadays and monolithic architecture burden and workflows does not provide the flexibility and speed that this modern stack bring. It's a win-win for developers and users.
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