[lucideer]

With the exception of actual XHR requests (which should ideally be for dynamic resources, and as such somewhat outside the remit of saving a webpage), I was referring specifically to JS loading JS, etc. solutions. React, Angular do not recommend/advise you to do this. This isn't a requirement in Web 2.0 or Web 5.0 or anything else.

In terms of React at least, fetch requests are not a part of the framework in any way and any present would typically be done in custom code in lifecycle methods. Even Redux, is—by default—client-side only. Stores are in-memory, actions populating them would make fetch requests with React/Redux-independent logic.

Other JS frameworks are, typically, the same. And all of that is just considering dynamic XHR. Loading scripts is much less typical, and never required. The most common application of this I've seen is the GA snippet, which mainly does it to ensure the load is async without relying on developer implementation: it's 100% unnecessary to do it this way.

So yes, unless you're distributing a tracking snippet that you expect non-devs to be blindly pasting into their wordpress panels and still have it work efficiently, generally speaking use of this method is never necessary, and commonly a red flag for poor architecture.