Only needs to be 'controlled' sufficiently to allow native populations to flourish though, remembering that a level of browse is desirable to ensure regen and spread of certain species' seeds. 'Uncontrolled' populations of deer (or to put it the other way deer populations controlled by the available levels of food) are insanely damaging to bush and prevent a lot of flora replacement from growing through. Possum, rat, cat, and mustelid have the potential to be more damaging on native bird as especially cats and mustelids don't have other options for food when birds and eggs run out...
Conversely 'uncontrolled control' leads to issues with bykill, species damage and non-tracked effects (invertebrates, amphibians, bats, aquatic) so there has to be an acceptable level of where we say that's it we've cracked it.
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