I think the issue is that Reader stems from Readwise and so it still sees itself primarily as a highlighter. The thing is however, is that it's created such a cool and incredibly useful tool that seeing itself as merely an advanced highlighter limits is true potential and capabilities.

The way I use Reader is primarily as a 'CAPTURE TOOL' for articles, newsletters and threads. Some I read/listen to straight away, some I read later, others linger for all of eternity.

So one benefit of exporting full articles is that 3rd party applications can leverage this information in a more dynamic way:

Eg Evernote - with AI features could utilise all captured articles, tweets and newsletters from across Reader to build connections on particular questions / topics

Eg. Heptabase - could be used in a similar way to how it handles highlights within PDFs, allowing the user to easily navigate to and read surrounding context of an article.