Well, technically a game telling a story that is a work of fiction needs to be believable as much as possible.

In works of fiction, you establish the laws of your fictional universe and attempt to have the user “suspend disbelief”.

Great fiction creators try and craft their story within those laws as much as possible and are able to maintain that suspension of disbelief for longer. We tend to call it immersion.

In the end it elevates the work of fiction so much more. And many of the gaming greats like Last of Us Pt 1 use it to enhance their game.

You haven't played this game then, there are so many details on the games that make it more immersive.

Collected samples but failed to extract? You don't get the samples then.

Reloading your gun don't just reload the missing ammo, you reload the full clip instead, and whatever was left in your previous clip are gone.

Sentry has limited ammos, eagle airstrikes need time to re-arm, every equipments on the ground can be picked up my anyone... etc

All these details adds up to make it an unique experience.

And friendly fire is very much needed... the chao is what makes it fun.

And hilarious!

Going to try that next time.

I think it would feel sterile if that's even possible to imagine.