If the off switch is instant, the block is decoration.
A blocker you can disable the second you feel the urge is not really a boundary, it is a reminder you can dismiss. The fix is not more willpower. It is making the decision to quit cost something, so the restless moment passes before you can act on it.
- Gate the controls behind Face ID, Touch ID, or a PIN so disabling a block is a conscious act.
- Keep recurring schedules running automatically so the boundary is on before the urge arrives.
- Add app-uninstall friction so deleting the distracting app to escape the block is not a quick backdoor during a session.