I struggled to work out what it was for and why I might want to install it on my Pixel 10 Fold - until it I went to the download page and dawned on me that it's to make non-Pixel phones look like Pixel ones.
It might be worth mentioning the whole reason for this to exist on the site somewhere.
"PixelOS is an AOSP based ROM, with Google apps included and all Pixel goodies. We aim to provide an experience similar to Google Pixel phones with numerous performance enhancements and a small amount of useful additional features."
Was this not on the front page when you looked?