In Aha, it's difficult to represent the relative effort required for different master features and features. Time is not the only consideration. For example, so features have dependencies that while not requiring heavy effort, will effect the duration of completion. Instead, I need to show with with different sized cards an additional dimension in the prioritization process. Features and master features that require more story points (or whatever type of effort) should be able to be visually larger than other cards. This helps tell the story to the business of which features require the most lift. There is no effective way to do this in AHA now.
While we can see value in visually representing size with varying feature card sizes, due to the options available and other priorities, we are unlikely to implement this idea at this time. We hope you can understand.