Show us a set of principles by which they would have had a better record with those very low budgets.
You wont, because it doesn't exist. Else you would be a rich man.
A better and more accurate comparison would be to compare the season wins per every "extra" dollar spent. Which moneyball had a positive effect on. Which is why other teams adopted the statistical scheme.
Guardians: 28th in payroll
Brewers: 23rd
2 of 6 division leaders.
And not all teams have the option to spend big. They instead rely more heavily on sabremetrics.
Else your exaggerated version of reality would BE reality, every season.