If your game looks washed PLEASE ADJUST YOUR BRIGHTNESS
I already posted in r/MHWilds but maybe it'll also help someone here.
In the brightness settings the third step is adjusting the overall luminosity, the screenshots here compare luminosity at 10 (middle) and 2-3 (the proper calibration according to what the prompt says)
Soooo many people (myself included) set this to the middle because in other games you usually have to set the brightness higher than what the game suggests in order for it to not look like a dark blob. But here it just fixes the very thing so many people are complaining about, which is the washed out dead looking colours. PLEASE do yourself a favour and adjust the brightness.
I see that almost every clip posted on MH subreddits has the luminosity set incorrectly resulting in a very washed out and bland looking visuals.
Shout out to "Blunty" who's yt video made me realise what I've been missing out on 🙏