Could they do it? Sure, should they do it? No.

At this point, they should give us the ability to 'downgrade' actions visually from the actions that get upgraded via a trait. The classic example is the Machinist Heated Shots. There are people that do not like the Heated Versions and would prefer to use the base versions, so allowing you to have the visuals of the basic shots but have the benefits of the upgraded shots should be the first priority, IF they were going to do a system like this.