The Cleveland Browns entered the 2019 season with the expectations that they would be a playoff team at the end of the year. Instead, they turned out to be one of the worst teams in the league and did not come close to making the playoffs.
With only six teams from each conference making the playoffs, the margin for error during the season is small. A team can survive a road bump or two during the season and still make the playoffs. But a team cannot have a roller-coaster ride the entire season like the Browns did in 2019.