Fan is loud - mine isn't?
Poor thumbsticks - mine are fine after heavy use?
touch screen loose - this is a new one, mine is fine.
battery life - not great, isn't really a big problem (can easily buy longer cords or charge when not in use/standby)
light - sucks, this I agree with.
It's not about just you though, I'm taking in what I'm seeing from other members here and around the net.
Multiple users here have stated their fan was loud, many also stated they think the fan is fine/quiet. Could be a case of a bad PS4, could be opinion, could be just the set up. But the fact that quite a few users have mentioned the loud fan means it is a known issue.
Your thumbsticks are fine, and so are many others. But there are still a SIGNIFICANT amount of users with deteriorating thumbsticks. What was supposedly an isolated incident is proving to be much more widespread. And yet some people are blaming it on misuse when it is clearly shown that the other controllers they own from other consoles are perfectly fine.
Touch screen issue is new to me also, but OP's claim is still legitimate. I'd say this is either misuse on his part or a bad controller. No other reported cases.
Battery life problem is as big as you make it but a lot of PS4 owners see this as one of the bigger flaws with the console.
Light is tied to battery life I guess.