Deadline mistake to avoid #4: Being afraid to trade from the farm
This isn't to advocate for the Brewers selling the farm, but they should be willing to deal from their prospect depth in the minor leagues. Don't sell the top guys like Jackson Chourio, Jacob Misiorowski, Tyler Black, and Jeferson Quero, obviously. These prospects should not be going anywhere.
But that's not only because the Brewers won't want to part with them and they are in the plans for the future. It's also because there really isn't anyone on the market that's worth any of those players. The top guys are staying.
The rest of the farm system, the non-top 100 prospects, the Brewers need to be willing to trade from that group in order to get the reinforcements they need at the big league level.
Perhaps the only prospect from that group the Brewers should focus on keeping that's not already in the majors is lefty Robert Gasser, because he's so close to the big leagues. Other than that, the Brewers will be just fine dealing the other prospects from their farm system.
Prospects are important for a small market team to remain competitive and the Brewers don't plan on going into a rebuil anytime soon. Matt Arnold said he plans to add "responsibly" and he's not looking to sell the farm for magic beans. But does that simply mean he's not willing to trade from the Crew's top five prospects in the system? Or how far down does the list go of prospects he's not willing to move because it wouldn't be responsible.
Be wary of dealing the Top 100 prospects, but don't be wary of dealing from the rest of the farm system. Hug the prospects you want most, but be willing to let some go in order to improve this team and give yourself a legitimate chance to be hugging a trophy at the end of the season.