I'm not sure this is a given. Picking up Suarez (143 wRC+, 3.1 WAR) bumps down playing time on guys like Durbin (105 wRC+), Ortiz (61), or Monasterio (59), while picking up Kwan (115 wRC+, 2.7 WAR) bumps down playing time on guys like Collins (128 wRC+), Perkins (83), Frelick (119), Yelich (119), Hoskins (115), or Vaughn (78 overall, 208 with Brewers).
Even if you think this year is an outlier, going the couple seasons prior Kwan and Suarez' production is pretty similar, but it's the guys you're replacing on the roster that makes Suarez a better fit to improve the roster overall.
2025:
2023-24: