Why do Australian Aboriginal languages have no generally accepted genetic connection to non-Australian languages?

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Distinctive features of Australia's Indigenous languages — Australian Aboriginal languages A discussion of the languages of Indigenous Australians.

Australian Aboriginal languages are considered a unique group with no generally accepted genetic connection to non-Australian languages primarily due to long-term geographic isolation.1

Archaeological evidence suggests that Australia has been inhabited for at least 40,000 years, with little indication of significant influxes of new inhabitants or extensive cultural contact with other Pacific peoples, with the exception of local interactions in the Torres Strait Islands. Unlike the linguistic landscapes of other continents, which were often shaped by rapid military conquests and imperial expansions, the linguistic map of Australia reflects gradual, stepwise migrations.1

While these languages share a distinct grammatical and phonological profile, the immense duration of their development makes the reconstruction of a common ancestor, or Proto-Australian, a challenging task for linguists.1