What we saw in 2016 was that even if a candidate were to contest a result, none of the election committees were willing to commit to a full hand recount; instead, the only options were to retabulate through the very same tabulation processes and machines that had produced the questionable results in the first place.
Without low barrier to recount by hand, the electronic systems production of paper trails is worthless. Arguably worse than worthless, because it leaves everyone thinking there is a usable backup, when there isn't.