This has been re implemented in AMS 2.1.7 for both Article Fields and Review Fields.
The General options section of the Article Field and Review Field add and edit forms have a new option named "Editable by user groups" (the screen shot is of the Article Field edit, but looks the same for the Review Field edit).

The General options section of the Article Field and Review Field add and edit forms have a new option named "Editable by user groups" (the screen shot is of the Article Field edit, but looks the same for the Review Field edit).

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