I think almost all vhin said is wrong lol.
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Another example of how top players are not too concerned with exchange variation, is Carlsen playing early 3...a6 lines. The latest example is against Sam Shankland https://www.chess.com/news/view/nepomniachtchi-joins-carlsen-anand-at-tata-steel-chess. Kornev covers these lines in his book, as an option to very solid but quite dry main lines covered elsewhere . http://www.chess-stars.com/resources/contents_Play%201.d4%20d5%202.c4%20e6!.pdf