render_settings_field_multibox() perfectly works for a group of checkboxes sharing the same name attribute. That is, a multi-choice where users can check multiple values for the same group.
This works in HTML but it's arguable useful for settings since there's rarely (never?) a setting with multiple values.
Instead, the current group of checkboxes in core are all single settings with a unique name attribute. They're visually grouped because logically related. However, the don't use the same setting name.
How to render a group like the following one?

The only way right now would be a custom callback 😞