The identifier field in its new form allows for users to either select an existing value from a fold-down list or to enter a new value.
However, editing a value has become incredibly cumbersome. As the cursor cannot be placed in the current content of the field, users wanting to edit it have to copy the content to the clipboard, paste it in the field again and then perform the edit. From our point of view, this new feature is a regression.
It is not by choice that we often edit the identifier field, but because we see no alternative to using it for PO line-specific shipping addresses, as a dedicated field for such data still does not exist in PO line records (cf. https://ideas.exlibrisgroup.com/forums/308173-alma/suggestions/47439848-ability-to-define-a-shipping-address-per-po-line).