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The archaeological findings at Jwalapuram, in the Jurreru River valley of southern India, have suggested that the tool culture found above and below the toba ash sediment actually differ in types significantly.Homoerectus presence in India (Kudiyam site, TN) is traced back to 1.5 million years before present. At Jwalapuram, both homoerectus and homosapien tools were found below the toba ash layer, whereas above the ash layer only the homosapien tools could be found. The OSL dates for the layers below and above are 77000 and 74000 BP respectively.This led to a view that homoerectus were wiped off from Indian region as a result of this mount toba volcanic eruption event.Further in light of such findings in India, early homosapien migration route in india has been mathematically estimated in certain research works.BBC documentary on the Jwalapuram site inferences can be found here.ReferencesPetraglia, M. D., & Boivin, N. (2014). Homosapiens societies–South Asia. The Oxford handbook of the archaeology and anthropology of hunter-gatherers, 328-345.Petraglia, M., Korisettar, R., Boivin, N., Clarkson, C., Ditchfield, P., Jones, S., ... & Roberts, R. (2007). Middle Paleolithic assemblages from the Indian subcontinent before and after the Toba super-eruption. science, 317(5834), 114-116.Petraglia, M. D., Ditchfield, P., Jones, S., Korisettar, R., & Pal, J. N. (2012). The Toba volcanic super-eruption, environmental change, and hominin occupation history in India over the last 140,000 years. Quaternary International, 258, 119-134.Haslam, M., Clarkson, C., Roberts, R. G., Bora, J., Korisettar, R., Ditchfield, P., ... & Eksambekar, S. (2012). A southern Indian Middle Palaeolithic occupation surface sealed by the 74 ka Toba eruption: further evidence from Jwalapuram Locality 22. Quaternary International, 258, 148-164.

No, they’re useful for purposes of historical, archaeological and anthropological research, giving us a great and scientifically sound means to to trace ancient population movements, key migrations, invasions, displacements and mixing events that happened in different areas of the world, as well as other demographic dynamics that would otherwise be completely lost to history (for instance, patterns of exogamy, sex-biased imports and exchanges of individuals, socioeconomic disparities with an impact on the long-term reproductive success of part of the population at the detriment of another, and things like that). Since haplogroups do not undergo recombination and a successive and endless division in half at each and every generation, they’re particularly useful to link modern populations precisely to ancient populations and thus infer migrations from one place to another place in the past.Now, if you’re asking if haplogroups are mostly “meaningless” in terms of an overall impact on the genetically determined physical, mental and behaviorial characteristics of the individual who carry it, then the answer is harder, but at least so far it leans toward the mostly useless answer. Y-DNA and Mt-DNA haplogroups may have some genetic influence on the genetic chemistry that rules the functioning of our bodies, but it must be really, really minor, to the point that scientists have, as far as I know, found no direct relationship between any given haplogroup and a particularly favorable or unfavorable feature in one’s phenotype. The fact that most populations of the world, even the most strikingly homogeneous of them, usually belong to several distinct Y-DNA and Mt-DNA haplogroups, but they are still extremely closly related genetically and phenotypically, nevertheless, hints to a mostly insignificant effect of having this or that distinct haplogroup.

Important events happening on Earth fall into two categories: natural and the results of human action. When we study these histories we follow political history, archaeology and anthropology to discover the important events in human history; and we study geology, biology, astronomy, and the rest of the natural sciences to discover the important events in the history of the planet. What these events have been or might be would be impossible to list, they are innumerable.