I also didn't see all these horrible turnovers you keep mentioning. He made some really risky passes along the offensive blue line that he needs to clean up, and one turnover that lead to a scoring chance against. When you move the puck as much as he was, there are going to be some turnovers. The numbers are also not "cancelled out" by turnovers, it's not even close. His successful transitions far outweigh failed ones.
Evan Bouchard who played by far the most minutes against Switzerland was awful for the second game in a row, constantly being caught out of position, caught up ice, missing zone coverage, etc. It's less obvious stuff than a few turnovers, but it's far worse defending than anything Smith has done. He's 19 though, so I expect Hunter to continue to roll him out for big minutes as that is what he said he was basing usage on before the tournament.