The Brewers improved the team with the best record in baseball. I think it is fair to say that that is hard to do.
And as much as we dislike witnessing the power-starved offense, and crave a big bat, there were very few "starting" quality hitters available. So, you are probably having to try and acquire a platoon/bench hitter. But right now, even though they lack power, those pieces all provide important cover for the each other. The 1st base platoon is fantastic, statistically, Sanchez is a legitimate backup catcher, and right-handed power threat. Hamilton/Ortiz platoon naturally and provide enough pesky qualities to be a positive in the lineup that night, and the outfield is a mash-up of defense and offense and you want most of them in the lineup most nights. DH has been an issue, for sure. But hypothetically, Yelich would represent just the kind of hitter that the Brewers could have acquired at the deadline, and he is obviously, already on the roster.
All of May, Romero, and Senzatela represent guys that reasonable people could expect to play an important role on a playoff roster. The Brewers improved the best team in baseball at the deadline.