Hezekiah Bacovcin and David Wilson argue that this methodology is invalid for discerning linguistic sub-relationship.
hˌɛzɪkˈaɪə bˈeɪkəvsˌɪn ænd dˈeɪvɪd wˈɪlsən ˈɑːɹɡjuː ðæt ðɪs mˌɛθədˈɑːlədʒi ɪz ɪnvˈælɪd fɔːɹ dɪsˈɜːnɪŋ lɪŋɡwˈɪstɪk sˈʌbɹᵻlˈeɪʃənʃˌɪp.