> Mobile users fundamentally engage with the platform in different ways. For one, they form a different demographic segment than older users, and secondly the mobile app frames and filters content in uniquely mobile ways. High-signal content is much more difficult to craft on a mobile device so more mobile use represents a greater proportion of content noise.

I'd argue the only thing that really matters about mobile users is they are online _way_ more often. Engagement can be higher on mobile because the access is mobile.