There’s a lot more to it as others have discussed. Your disagreement is noted.
For one thing, almost half of the Brewers starts last year came from pitchers no longer on the roster.
Are those starts going to be taken by pitchers who will cover as many innings and, as a group, be as effective as those pitchers?
With potentially more innings to cover, will the bullpen be as effective as last year, even without a proven closer?
Is the offense really going to be better than last year, and by enough to make up for what figures to be a less reliable pitching staff?
Lots of big questions and several unproven players will be providing the answers.