Trading major league assets for rentals, is essentially shuffling the deck with a hope to improve in the short run. Everything could click and the team could improve. Or, the rentals could flop ( happens all the time Chafin, Norris, Schoop etc.) or the young talent you’re banking on to fill in the gaps for the major leaguers traded away could also flop.
It just seems like it’s making moves for the sake of making moves.
As for Civale’s value. Don’t forget the Brewera didn’t give up any value to get Montas. So pitchers with pedestrian numbers are t all that valuable. With Vaughn they got a recent #3 overall pick who has hit 77 homers in the majors (averaging 20 HRs/162 games), with a year and a half of team control remaining and options. It’s a cruel world, but that’s probably what 12-15 starts from Civale is worth no matter what.