can you name some of these challenges. because i can only think of one or two challenges that were worthy of the name.
1. the scaling challenge: which lasted a couple of years and it is finally coming to an end. with activation of SegWit it moved forward and it is nearly done until we get the drama in a couple of months and then it is completely over.
2. the adoption challenge: which has always been with us ever since the start and it is slowly improving.

the rest are just drama, like government, regulations,... and most of them are FUD anyways so i wouldn't consider them as a half challenge even.