Sony are still very much in the driving seat, and know exactly what they are doing. There’s not point putting on a lacklustre E3 with games and trailers that gamers have seen for the last 2/3 years in a row. It makes perfect sense to hold off until they have all their heavy hitters ready to go. The anticipation for PSX2019 will be through the roof, and the media attention will be just as, if not more focused on what Sony will have to show. If the rumours are true of a PS5 reveal, then Sony will have the entire stage to themselves and will not have to compete for media mindshare during a crowded E3.