I think because there have been no running lanes, the few times he has gotten opportunities, he's now running timid. Last year he looked much more more explosive through the hole, but now he kinda gets the ball anticipating contact immediately, and that makes him pick his way tentative, and not explosive. Last year he proved he had adequate speed in several games. If there was a lane, he exploded through it. I 100% agree about his lack of vision, and inability to make people miss.
The mark of an elite back is the ability to make something out of nothing. We don't have RBs right now who can make something out of nothing. Tatum appears to have some of that in his tool bag, but we haven't seen enough of him to truly know. If Barnes is our best back, well........ all I can say about Barnes is runs like he thinks he's Earl Campbell or angry AD, but when he takes on LB's and physical DBs, he gets hammered every time. He has zero tackle breaking ability, and he NEVER makes anyone miss. I've never even seen him attempt to avoid contact. He seeks out defenders, and gets blown up most of the time....