In February, the NY Times writes, "The Justice Department charged 13 Russians and three companies on Friday in a sprawling indictment that unveiled a sophisticated network designed to subvert the 2016 election" [1]
OK, so Russia had this expensive, sophisticated operation to influence the election. It wasn't a half-assed effort.
So why wouldn't this operation include attacking voting machines? Especially if the machines are vulnerable and virtually unprotected?
[1] https://www.nytimes.com/2018/02/16/us/politics/russians-indi...