Nem on 20 October 2015
Yeah... i would say the main reasons were the memory cards and how Sony didnt support the device either due to lack of faith or lack of capability of their first party studios that didnt carry the same weight as Nintendo's with the 3DS.
Also, some mistakes from the past wich ended with the loss of the Monster hunter franchise.
Mobiles took away the casuals, that is true, but Sony failed to lure in more hardcores.
