It's true in the case of Microsoft (not a single game was shown that a non-Xbox fan would have any innate interest in, nostalgia wise, except for the new Platinum game).
Sony, on the other hand, showed off what appears to be a true Dark Souls successor (appeals to multiple platforms) as an exclusive, Grim Fandango reboot (appeals to '90s PC crowd), Magicka 2 (PC crowd), Let It Die (Suda51 fans, if they still exist, follow the games regardless of console), and so forth.
Sony simply has more in the wings. There's a reason why it is outselling Xbox One. People know that its gotz the games.