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Precisely.My Ydna is pretty static very shallow depth, high in the R1b hierarchy, how much new info has accumulated in my YDNA since 5000+years ago? Meanwhile new genetic info has accumulated from both the male and female ancestors over 250 generations. For example my mother's side of the family has a mutation in the BRCA1 gene that is only found among the Eastern Dutch/Western Germans in the border area. Interesting, right? When did that mutation enter my mother's genetic inheritance? How did an Eastern Dutch female find itself in Thrace or the Balkans?
Also think about it. Let's say that a Slav ancestor entered Thrace in 600 AD. For arguments sake, let's assume that no further Slavic input entered my ancestral stream. My Y-DNA would be some subclade of I2a-Din for example. This Slav ancestor's autosomal contribution will disappear after 10 generations according to you. So am I a Slav or not? According to my Y-DNA I am but the genetic autosomal has been diluted to extinction.