Off the top of my head, some of the cross post aggregation that piefed does in the web frontend was only very recently (like literally yesterday) added to the api. Post flair is another that was only just added to the api within the past week or so, so I don’t expect it has seen a lot of use yet in apps. Lots of the features around feeds and topics aren’t included yet. And, most annoyingly for me, is that most of the notification types are not returned in the api yet. So, you can end up in a scenario where the api will tell you that you have X unread notifications, but since some of those notification types might not be defined yet in the api, you can only interact with a subset of them.
Off the top of my head, some of the cross post aggregation that piefed does in the web frontend was only very recently (like literally yesterday) added to the api. Post flair is another that was only just added to the api within the past week or so, so I don’t expect it has seen a lot of use yet in apps. Lots of the features around feeds and topics aren’t included yet. And, most annoyingly for me, is that most of the notification types are not returned in the api yet. So, you can end up in a scenario where the api will tell you that you have X unread notifications, but since some of those notification types might not be defined yet in the api, you can only interact with a subset of them.
We are working on it!