default Youtube app: can't subscribe to playlists created by other users

Apple includes YouTube App with your device. It works fine for me.

The default YouTube app definitely needs to be reworked.
For instance, I am subscribed to about 80 different channels but I only see 50 of them on my iPad and 25 on my iPhone.
I tried signing out and then signing in again but it stays the same: 50 channels on the iPad and 25 on the iPhone.
I also don't like using the Safari version of YouTube but I'm forced to do it because of this bug.

The default YouTube app is pretty terrible. I haven't used it in a long time. I simply use the YouTube mobile site instead. It works better than the app. Just add it to your home screen for easy access.