The archived message is included in the Mobile app but not in the desktop app. The user wants to use this option primarily in the desktop app.
It appears that these two platforms (Mobile app and desktop app) should offer consistent options, as they essentially serve the same purpose. One is designed for use on a smartphone, while the other is a desktop application.
Archiving appears to be the more favourable choice, as it allows for the recovery of messages. On the other hand, permanently removing messages, such as through deletion, should primarily be carried out on the web version, which is intended to be the most robust.