Yes it does affect other OSes on other devices, however other OSes aren't up front about what their 'support' of End of Life hardware means and misleads/misrepresents doing so as secure/private. They treat users as ignorant and the terms as marketing gimmicks.

GrapheneOS takes users security and privacy seriously, you matter which is why we are brutally honest in such matters and only recommend OEM supported Pixel devices as they are the basline the majority of other OEMs never match.