There is currently a variety of options available at the product line and account levels, along with a subset of other actions which can be set at the product level.
The rationale for the specific capacity planning feature is that we believe that in the primary use case in this area is to allow a specific product manager to control this feature for each of their individual products and teams). Doing so allows for greater flexibility for each user.
While we can understand the potential pain point that you had described, we currently do not have plans to make updates in this area due to current priorities. We hope you can understand.