In reality this kind of tests can only be very precise and conclusive if the laboratory that sells you thiat service has a very large database of DNA sequencing of an infinite number of human populations to achieve the correlations.
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Yeah, there are limitations. I believe that MyHeritage does give you an update to your results as more data become available and their procedures improve, but it will never be 100%. Those from the Indian subcontinent seem to be very poorly represented right now.