Yes. The idea is that admin-created webhooks should be managed manually, where they can be modified and removed manually. But add-ons need UI modules, webhooks, and other resources to be available “atomically” – that is, all at once, or not at all. It would create a lot of problems (or at least much more error handling code for add-ons) if an admin could modify or remove the webhook that an add-on needs.
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