DecisionUse Simple Add More to improve editorial experience
Drupal core by default outputs the maximum number of values (cardinality) as empty elements on entity forms, which usually represents a poor user-experience.
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Drupal sites will use Simple Add More to enhance the usability of entity forms.
This is recommended on both new projects and existing sites, since it improves the editorial UX with low effort.
There is a core issue to provide similar functionality, using core's built-in AJAX button. This solution using client-side JS might become obsolete when the above core issue is fixed.
We will provide a better editorial experience using form elements for fields that accept more than one value.