Pages that are empty without JS: dead to history (archive-org), unreliable for search results (despite any search engine claims of JS support, check it yourself), and thus ignorable.
No need to waste time reading or responding. Also known as, if it’s not curlable, it’s not on the web.
Because in 10 years nothing you built today that depends on JS for the content will be available, visible, or archived anywhere on the web.
All your fancy front-end-JS-required frameworks are dead to history, a mere evolutionary blip in web app development practices. Perhaps they provided interesting ephemeral prototypes, nothing more.
Ahem ... The live SinglePageApp version of CardiganBay is like that. But not the static site. There is a tension though between dynamic, easy to write, quick and easy for machines to read.