• You can schedule messages
• Have supergroups, subgroups, broadcasts, admin roles in groups,…
• Channels can be configured in various ways. For example, you can post messages and choose the type of previews links render.
• You can add voting options to posts
• Members of the channel can only reply in threads so the replies are bundled.
• You can decide wheter new group members can view chat history or not.
• Members can be muted.
• Bots can be built withing the app
• Chats can be arranged in folders *…

I could go on.