I'm pretty sure that is critical for PSVR.
Which didn't exist when the console was released, and isn't owned by the vast majority of PS4 players. When it was announced, the use cases were things like showing the player colour or health status. This light is poorly positioned for player feedback (changed in version 2), apart from the fact it was so bright the glare was very visible on the TV. The criticism against the light-bar had been proven valid as everything gamres complained about came to pass - poor battery life, glare on screen, no benefits.
Wow the arrogance to think that all great ideas weren't preceded by a bunch of ideas that were crap, oh yes the geniuses here know exactly what's going to be a great idea and would never have one that doesn't pay off.
Mate, just discuss things. We're allowed to think ideas are rubbish only to be proven wrong later. Maybe biosensors will be the greatest thing to come to gaming? Until then, I'm going to argue they're a waste of money and effort.
Lots of people thought the share button was a waste.
Really? Even if sharing wasn't a thing, another button isn't particularly bad. Ideas that weren't great because they saw almost no functionality in games were:
Motion controls - I was a huge advocate of Sixaxis and talked at length about the applications it could have had, but none of that happened.
Touch pad - Some people use it for keyboard input. I think that's about it. It's basically a huge button to open inventory.
Light bar - only of value for camera tracking. Again, largely unused.
Kinect 2
Voice control - been an option for
years, but it's not popular by any stretch.
Pressure-sensitive face buttons - barely used, so Sony ended up removing them.
I think there's plenty more on NSW not used much either.
How many controller additions have actually had meaningful value? Second stick. Shoulder buttons. Analogue triggers...all stuff that's logical and makes sense. Under-side paddles will be another valuable addition. Haptic feedback on triggers and sticks, possibly.
So now, instead of getting snuffy about it, actually look back at 30 years of consoles and analyse how controller features are and are not used, and get back to me with a decent argument in favour of bio sensors instead of an angry rant that people aren't excited by a possbility. Be realistic. How viable, really, are biosensors in a single platform? How many games will benefit and to what degree? You can list a load of possibilities like, "imagine a horror game where it can tell how scared you have and you have to control you sweaty palms," just like I excitedly listed a whole loads of games that'd benefit from Sixaxis back when that was announced, but features aren't adopted on possibility but on practicality and economics.