This is also true for Web apps that do not have meaningful amounts of client-side code.
> Caching also works for client side rendering
There are obviously a lot of differences in how caching works, but client-side caching is generally strictly worse than doing so on the server. Using the e-commerce example in TFA, every browser has to maintain their own cache of the product information, which may include cache-busting things like prices, promotional blurbs, etc.
The server can maintain a single cache for all users, and can pre-warm the cache before any users ever see the page. Adding fragment caching, which allows parts of a page to be cached, a server-side caching strategy will typically result in less total work being done across the user population, as well as less work done at request time for each visitor.
