How do you explain games that have it then? That those devs just worked harder to overcome whatever problem there is to implement it?
The only concrete info we have is an ICE team member saying there's no problem with implementing the effect on the system.
Clearly there's something going on. It doesn't seem to be with the system as evidenced by games that have it, and the comments from the ICE dev.
I don't see why it's implausible it's on the dev side, whether it's a problem with their dev tools, an issue with specific engines not implementing the effect properly on the system (something breaking the flag when porting to PS4?), and devs just simply not noticing, not caring to fix it, or not having the time to fix it. Or a combination of all of that.