Frankly, from most of the pundits who are predicting the playoff series... yes, they predict the Brewers won't go as far as they could because they lack that game changing power. Look at the Jays playoffs last year, power is what put them over the top, they got those 2 and 3 run bombs when they had base runners on.
Springer's bomb, Varsho's in the early part of the playoffs, Bo in the WS, Vlad .... all of those were needed to help Ernie's 800 singles turn into runs.
Anything can happen in the playoffs, but yes, if you were handicapping the teams in the playoffs, the glaring hole in Milwaukee's lineup is game changing power.
Cubs are kinda the opposite. PCA has pop but he can also go completely missing for a week at a time and be useless.