I'm with you on reliever WAR, it significantly overrates relievers compared to starting pitchers.
Pagan might not be closing out the game, but they're still going to use him (or someone like him) just like the Phillies have had to lean on Jeff Hoffman to get them through close playoff games. Meanwhile 2023 All-Star Craig Kimbrel has been awful.
If paying a premium for 60 regular season innings doesn't make sense, it makes even less sense for 3 postseason innings. The best pitcher is often someone the batter hasn't seen before. The Twins strategy of turning their unused starters (Maeda, Varland, Paddack) into relief help was effective.