[qwerty1234599]

What... the reason for JS frontend frameworks is to be able to dynamically update data visible without a full page refresh/refetch

[scarmig]

JS does add some capabilities around avoiding full page refresh/refetches. See e.g. Turbolinks or PJAX for libraries that help with that.

Frontend frameworks do a hell of a lot more than that, though. Much of the time, they're doing things that are either the result of shortcomings in browser standards and implementations or things that are just stupid.