Drupal\name\Element\Name should extend FormElement rather than RenderElement?

Currently the Name element extends RenderElement

use Drupal\Core\Render\Element\RenderElement;

class Name extends RenderElement {}

Which seems strange that this even works with the FAPI, albeit, it does.

use Drupal\Core\Render\Element\FormElement;

class Name extends FormElement {}
abstract class FormElement extends RenderElement implements FormElementInterface {}