No matter what the reason turns out to be what it ultimately boils down to is the way AMD won't entertain developer invites during development, if you don't bother pulling a chair up to the table like Intel and NVidia both did then don't be surprised when the others who do attend shaft you. AMD customers are the ones who are ultimately hurt because AMD just make their usual excuses absolving themselves of all responsibility and their most loyal fans lap it up, so nothing will ever change.
Expect a patch in about 3mths time if you're lucky because 3mths ago AMD were still living in cloud cuckoo land expecting Intel and NVidia to do what's in AMD's best interest.
Yeah, I'm not happy, but the card is excellent in all the other games I play. I'll go and buy a GTX 970 for 250 quid, but selling my R9 290 which I bought for £200 6 months ago will hurt the wallet a bit.