A custom component does get a copy of the root form value, however, this value is not updated if it changes by interacting with the form.
Writing other values:
There are cases where a custom component might have to write other form fields. Currently this is only possible if the custom component "controls" the entire object. A possibility might be emitting another kind of change event to the parent. The parent can then send it up to its parent or treat it like an "internal" change.
Reading other values:
A custom component does get a copy of the root form value, however, this value is not updated if it changes by interacting with the form.
Writing other values:
There are cases where a custom component might have to write other form fields. Currently this is only possible if the custom component "controls" the entire object. A possibility might be emitting another kind of change event to the parent. The parent can then send it up to its parent or treat it like an "internal" change.