On most of the other platforms, I can mass edit tags for my videos by selecting multiple videos and using the context menu. But the Plex iOS app only lets you add to a playlist, the usual editing features are missing. Could we please expand the iOS app to include more of the usual capabilities?
I disagree. If I wanted to use the Web app, I might as well uninstall the iOS app.
The iPad app already has bulk editing for playlist membership. It just needs bulk editing for collection membership and air date to become a richer, more rewarding experience.
Playlists and collections are different things. Playlists are basic list with no metadata, just add/remove. Collections have their own metadata and managing this from other Play clients like the iOS app would require a lot of effort. Not saying it won’t be possible in the future, but there are no immediate plans to bring admin features like this to other Plex clients.