GrapheneOS provides massive privacy and security benefits to regular people. That was always important to regular people due to regular devices being nowhere close to good enough to protect people well enough against common threads to their privacy. However, it's far clearer now that exploits have been made so widely available without having expertise. There are many publicly available Android local root exploits on GitHub usable on these devices.
I think it heavily depends. If you are concerned cops or CBP are going to try to take your phone and search it then wanting a phone like GOS is a very reasonable precaution.
Even if you haven't done anything "wrong", you may have engaged in speech or activities that the current US admin has deemed problematic and will try to punish you for if they can find any evidence.
Why would you assume Google, Apple, and defense-oriented agencies like CISA wouldn't also have access to those same models, but using them to fix issues?
Its just raising the bar across the board, I don't see how only attackers would benefit.
