I think they often disrupt a dial. The hole cut into the dial works best when it is an organic part of the design.
Breguet, for example, may pair the tourbillon with a sub-dial to give symmetry and visual context, such as in the classic 3350 or in a tourbillon chronograph, where the chrono subdials serve the same inclusive function.
Trying one on in the boutique
Trying another on in the boutique. Here, the power reserve serves the function of visually bringing the tourbillon into the design of the dial.
function.