> Even if it improves accessibility, it must be rejected out of hand
GrapheneOS has many exploit mitigations and those that would break compatability with too much apps are opt-in instead of opt-out. They also have per app toggles so you can decide to use them per app. So they certainly don't sacrifice accessibility for the highest level of security.
> GrapheneOS promises to liberate us from the enshittification of Google's anticompetitive moat
This isn't something GrapheneOS promises anywhere on their website. They aim to offer a secure and private OS with good compatability with Android apps.
> but it focuses that effort exclusively on security.
They focus on privacy and usability as well. Security is actually only focused on because the privacy features aren't enforceable without security.
> Why is that constantly treated as an unreasonable fantasy?
Because tinkering, hackability and unrestricted freedom aren't the purposes for which GrapheneOS was made.