There are running QB's, and there are passing QB's who can run... who can also beat superior defenses from the pocket with their arm.
Being able to beat playoff caliber defenses from the pocket is a pre-requisite for winning in the playoffs. Lamar can't do that.
His team uses scheme to mask the fact he isn't an accurate passer, it's why he annually ranks among the fewest pass attempts in the league.
If he were actually a great passer like Herbert or Mahomes, they wouldn't be afraid to let him pass the ball. He needs to be curated, protected using scheme, his team has to get a lead early and play from ahead.
He needs guys wide open using RPO and play action because he can't consistently connect on tight window throws or throws to smaller targets. He has to have 2-3 TE's on the field at all times, because he needs to have 6'5" 250 pound targets with really long wingspans to throw to. His stats in college and as a pro affirm this.
He's the modern equivalent to Michael Vick. Exciting, fun to watch, great to play on Madden... but his ability to win actual playoff football games is limited by the opponents they play. And the odds the Ravens will face 3-4 poor defenses on the way to a Super Bowl win is next to nil.