I'd argue that most sites are "documents" that have had "apps" unnecessarily shoehorned into them for cosmetic or financial reasons.
I once had a site beg me to enable JS "for a better user experience", one which didn't need it to work. I did, and promptly turned it off again when I realised what the "better" actually meant (see above). Not going to fall for that one again...
Yet for some reason (hint: money) newspaper websites load megabytes worth of scripts to display kilobytes of text.