Alright, I understand better now, thank you for your feedback. Basically, the vast majority of apps don't need access to the "Sensors" permission, except those using the camera (Camera, Signal, etc.) and navigation-based apps (Organic Maps, Magic Earth, etc.).
I will disable this permission by default for newly installed apps. However, I am really surprised by the data that can be collected through the enabled "Sensors" permissions. Why is this option enabled by default in GrapheneOS, given the significant data collection possible?