I'm really excited with this news
They're experimenting alot with their music. Experiments take times, it's an trail and error phase.
Plus every artist got their own work ethics, the other might knock faster an album, and the other takes his time. I personally prefer the second one.
why stop making tracks if creativity keeps flowing, it just might be they'll make a new song what's better than they recently got.
just my opionon on the 'it's taking them to long comments'
Peace!