Everyone knows the new MBP screen is better, but people are saying that pictures and videos that aren't optimized for the new screen won't look better.
I don't want to spend like 1500 bucks then not even notice a difference at the photos and videos I view.
Everything will look better because it's a brighter screen (compared to previous MBPs) with better contrast and better colors. Even without P3, Apple makes screen improvements with every generation and even on regular photos, the colors "pop" more. Especially the reds and yellows. Also, on P3 material you can see more nuances with these colors.
However, the improvements are not mind-blowing compared to previous screens. My iMac 5K (from 2014.) doesn't have a P3 screen and neither does my 2013 MBP - and they still look great and really close.
If screen quality is the main reason for you to upgrade - it's probably not a good idea, the difference is small.
But the screen is not meant to be the sole reason to upgrade. Faster, smaller, better build, Touch Bar, USB-C - combined, these things make a compelling reason to buy - and, sure, a slightly better screen. But if you ONLY care about the screen and already have a Retina-screen Mac, there is no reason to get a new one.
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I guess what I'm asking, if the new screen is 15% more contrast out of the box than the previous gen macbook...why can't I just make my screen 15% more contrast through accessbility settings and bam I'm good
You will not gain detail by increasing the contrast on the old one, the image will just be tone mapped. A screen with larger contrast will be able to show a wider range of detail - in other words, it will look more realistic, as opposed to just making dark things darker and bright things brighter.
In a way it's like saying why do I need a 12Mpix camera when I can use a 6Mpix camera and double the image size in Photoshop?
Still, as I said above, the difference is not huge and you probably won't notice it. Don't buy this expensive computer for the screen improvements alone.