Yes, you're right, they're not "ancient" in any meaningful way. However, studying long isolated languages is still interesting, since whatever similaraties can

Yes, you're right, they're not "ancient" in any meaningful way. However, studying long isolated languages is still interesting, since whatever similaraties can still be discerned between (say) Indo-European and Andamanese languages were presumably present in the common ancestor of these languages, which probably existed more than 60k years ago. Thus by studying an isolated language, we might learn something about an ancient language.