I can only offer a comment about the advantage of having the lights track with the handlebars, or lack thereof. At anything over parking lot speeds, I turn the bars so little that the lights would pretty much be pointed straight anyway. I can’t see any advantage to mounting the lights so they track bar movement, especially if the have a fairly wide beam pattern. In “normal” riding, handlebar movement is negligible. In corners at cruising speed, you apply pressure to the bars to initiate the lean, then straighten them to allow the lean to continue in equilibrium until the turn is completed.