What is the use of create/delete permissions in access field configuration of user groups?

I understand

* read access: If it is not checked, the field is invisible.
* write access: If it is not checked, the field is readonly.

but I don't see the effect of create/delete permissions in access field, I can fill or left empty the field despite the create or the delete permission is not checked.

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Jordi Esteve
Consultor Zikzakmedia SL
jest...@zikzakmedia.com
Mòbil 679 170 693

Zikzakmedia SL
St. Jaume, 9, baixos, 2a
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