Dan Szymborski at Fangraphs writes that the Royals missed an opportunity to improve the outfield.
We have position-specific data going back to 2002, so starting in that year, I looked at the positional WAR for every single team that made the playoffs. I omitted DH for NL teams during the non-DH seasons, since most of them had something like -0.5 WAR in 45 plate appearances. I also excluded 2020 as a whole because of the small sample size of games and sudden irregularity.
Among the 222 playoff teams, 90 of them had a single position below replacement level in WAR.