konkari on 09 March 2018
My take is that biggest mistake was the strategy late 90's and early 2000's when the CBS content creation side started to push for DMR which led to Sony trying to push proprietary formats, hence Sony missed out mp3 players totally, and later led to BD DRM issues and the Memory stick for Vita, which essentially limited the expansion of Vita as platform.
Fortunately they changed a lot towards openness under Kaz
