According to the list of deprecated features, delta links will be removed as of version 24 because they only existed to support a product that no longer exists. Webhooks can be used to track changes, but it's not a sufficient replacement because webhooks operate server-side, rather than client-side.

If a service only allows for client-side polling, an intermediate server would be necessary to receive the webhook signals, log them and provide delta links - which is far more arduous and much less secure than native support of delta links in BC.