Task archivation is confusing

When I complete a scheduled task in a mobile app, I'm always asked if I want a task to also be archived.

1. I have no idea what task archivation means;

2. I'm only using native Morgen tasks, so if archivation is sth related to 3rd party task providers, I shouldn't be bothered with it;

3. I'm not prompted similarly, when I complete a task in a desktop app, so I don't see why mobile needs to be different.