Biggest issue is that skein has only two coins. DGB was the only coin of the 2 that could do as much as $15 a day with 1080ti but now DGB just falling because lack of development. It's all about value keeping up with difficulty. Which means the community of DGB has to grow. They can't stay stagnant forever.
I think so far, the DGB development is OK. some times, it is slow.