Well, Crytek's financial state isn't the most stable for one. Also Lumberyard's aim is to replace pretty much everything in the long run, some parts of the CryE

Well, Crytek's financial state isn't the most stable for one. Also Lumberyard's aim is to replace pretty much everything in the long run, some parts of the CryEngine are quite...interesting compared to other engines and the work Amazon has done for example regarding animation and workflow improvements has been great.