Remember this post (click on it to see the thread)?
It seems that the feature wasn't missing at launch as many believed. Devs just haven't used it yet, except Tecmo Koei
EDIT:
And tomb raider
EDIT 2:
It seems that the feature wasn't missing at launch as many believed. Devs just haven't used it yet, except Tecmo Koei
EDIT:
And tomb raider
Tomb Raider has die/revive interaction.
EDIT 2:
Yakuza Ishin also uses it
After you clear the game’s story and arena play spot, you’ll unlock the “Bakumatsu Tour” mode, which works with PlayStation 4′s Share feature. With the push of the Share button, players can live broadcast their game, or post video clips and screenshots. During a broadcast, viewer comments will be displayed in the game in real time. In the arena, if a certain number of comments are displayed, there are special effects that can occur like you’ll recover quicker from being knocked down, or build up heat faster.
http://gematsu.com/2014/01/yakuza-ishin-playstation-4-features-detailed