How does opting into automatically applied recommendations help an account-holder?

It helps to maximize the effectiveness of recommendations since it triggers automatic increases in budgets to cover the costs of recommendations.
It helps ensure that best practices are applied across all campaigns, since marketers themselves choose which recommendations are applied across a whole account or manager account.
It helps ensure that recommendations that are most likely to have the impact on campaigns are the ones that are applied, since this analysis and implementation occurs automatically.
It helps make sure that optimizations are based on recent rather than old activity, since only the past week of data is used to inform them.

The correct answer is:

It helps ensure that best practices are applied across all campaigns, since marketers themselves choose which recommendations are applied across a whole account or manager account.