I wouldn't exactly say the Brewers "don't need" another OF like Varsho. Ideally, you would only want to rely on one rookie to hold down a starting spot. Yelich will be in LF, but as of now, we're looking at two rookies taking a significant share of starting opportunities at the other two spots. Varsho would be someone who could provide that veteran experience and would be a significant overall upgrade over Renfroe/Taylor as he produced a 5.0 WAR last season. I disagree that people want him simply because he's a "WI boy". He's just a really good ballplayer period who provides you with GG defense in RF and CF with the potential of a 30/20 season while being under team control for four more seasons.
At the same time, the cost for Varsho will be quite high for these very reasons. And AZ is demanding non-OF prospects/players in return, which cuts against the strength of our farm system. Something like Ashby, Turang, and Quero would likely be required. Too steep of a price imo.
I think we're better served signing a guy like Wil Meyers, a certified lefty masher, to a one year deal to rotate in the OF and 1B with our outfield prospects and Tellez. Taylor could then be traded for a reliever or two.