Do you daily browse with it ? Do most websites work without javascript ?
Text-based sites like (most news orgs, blogs) work just fine. Blocking JS even disables the paywall for some.
The sites that break down are YouTube and other sites with lots of interactivity. E-commerce, restaurants, Pinterest, anybody with a complicated frontend.
That's why the JavaSnipt default is "allow JS everywhere except on domains you block." I've tried disabling JavaScript at the system level (iOS Settings -> Safari -> Advanced) and it's really not a good experience. You constantly have to turn it back on for your bank website or whatever.