One problem with GrapheneOS is that it only supports a tiny handful of devices, and only for few years (at best) per device. A lot of people can't afford to keep buying Pixel phones on that schedule, and some who can afford it find the e-waste unappealing.

This isn't exactly the project's fault. It's more a side effect of an industry that prevents customers from securely installing an OS on their own hardware, and/or refuses to provide firmware security updates beyond a rather short time frame.

I hope that changes. I love what GrapheneOS attempts to do, but at the moment, I think using it is unreasonably hard on the budget and the environment.