So summarizing: its intent isn't clear?
FWIW: Pocket is similar in general design to a number of "read it later" services (the Android app is still identified as "com.ideashower.readitlater.pro"), such as the now-defunct Readability, still-extant Instapaper, Maciej Czeglowski's Pinboard, and the FS/OSS Wallabag. There's a ... (very?) loose kinship with tools like Zotero, Calibre, and Elsevier-owned Mandelay, also knowledge-management / article management tools.
Pocket lets you:
- Save articles for later reading.
- Display many (though not all) of them in a simplified and standardised "reader" view.
- Apply tags. (I abuse this feature horribly.)
- Add highlights. (3 per article for the free version, unlimited for pro.)
- There is of course a social feature allowing shares and recommendations. I avoid this like the plauge.
- There is, inexplicably, no way to share, export, or otherwise save a bibliographic reading list, say, of articles on some topic.
- Exporting the article listing is possible (JSON format). You'll have to re-fetch items individually if you do this.
- Articles are not saved and you're still subject to linkrot, edits, or substitutions at the origin source.
- Saved content is accessible from any device by account, either from a Web client, from Firefox itself, or through Mobile apps (iOS, Android).
The functionality exceeds that of bookmarks, sacrifices local control and storage.