It's both sad and understandable. So many Applications would want to be running in the background for data collection reasons or just user responsiveness. While it could be a permission, after watching so many people just hand out "Sure, have my location always and forever" to any application that ask for it, the OS would get totally overwhelmed.

This P2P system would probably only work if implemented by Google/Apple themselves and they have zero desire to do so since it's a feature almost no one would want.