Stars activating on a natural draw is a subtle cost to draw abilities. Drawing 3 or so is good, but you lose value if any of those three are stars. It adds depth to deck design, and while there are fun combos that would be available if this wasn't the case, I think the game would be worse off. Do you build based on drawing, and risk losing stars, or do you build your speed from searching, and hope to draw your star cards naturally by thinning everything else?