5 wins from one player >> 5 wins from 2 players. If anything, the current iteration of this roster (2.5 win players for daysss) highlights the importance of this.
And I think it's pretty fair to question whether a team making a playoff push would have two guys they realistically believed were 2 months of baseball away from being 3 and 2 win major league players but were choosing not to use them in said playoff push. Even the Orioles, who everyone will tell you has juggernauts all over the field blocking elite prospects, have given substantial PAs to Mountcastle (374, 0.9fWAR), Ramon Urias (166 PAs, 0.4 fWAR), Mullins (300 PAs, 0.3 fWAR), and Austin Hays (169 PAs, 0.1 fWAR).