Hi, i'm using an older Samsung device with One UI. Using Exodus to analyze One UI components, I found trackers integrated into several of them, including the launcher.
IMO it would defeat the purpose on a GraphrneOS
I don't have the full report handy anymore, but i used this website and their app to detect all sort of trackers: crash analytics, location, profiling, alalytics, identification, ads...
https://reports.exodus-privacy.eu.org/en/
And i recall that the OneUI launcher was containing some trackers, one for ads and one more for analytics if i still recall correctly (to be confirmed)