Running backs drafted in round 1 the last 10 years:
2021 Najee Harris, Travis Etienne
2020 Clyde Edwards-Helaire
2019 Josh Jacobs
2018 Saquon Barkley, Rashaad Penny
2017 Leonard Fournette, Christian McCaffrey
2016 Ezekiel Elliott
2015 Todd Gurley, Melvin Ingram
Between these 11 first round backs there are two Super Bowl rings. One of those rings is Edwards-Helaire who was the third string guy on the Super Bowl team. The other is Leonard Fournette who didn't win a ring for the team that drafted him and won his ring on a cheap one year deal after an underwhelming stint on the Jags.
Even if you "hit" on a guy like Gurley or Zeke you're lucky if they don't fall apart before 5 years. Zeke has looked like he is toast the past couple seasons and currently is a free agent at 27 years old. Gurley started to break down in only his 4th season and was out of the league at 26. Running back is not a position to waste a premium pick on. You can draft guys in the mid to late rounds every other year and just keep cycling through them as they eventually break down. It sucks that the position has been so devalued but it is just the way the game has gone. It is a passing league and the first round picks generally reflect that. Quarterbacks, tackles, receivers, pass rushers, and corners are the positions worth taking in the first round because they all center around making or stopping the passing offense. You can plod away all day giving a RB 25 carries a game and you will score 20 points and he will be on IR by December.