Having been riding for 44/45 years, I have developed the K.I.S.S. Theory. If something works, don't fix it.
The drivability (ride-ability) of any vehicle depends on it to perform as the design intended it to in it's basic form. This opinion does not apply to cosmetic accessories. Only those modifications that significantly affects the engine performance.
One of the reasons I believe this is because, I have heard and witnessed most of the complaints of mechanical, electrical failure from those that have made drive train modifications.
Even though a factory builds into a design a certain amount of tolerance for limited modifications, my convictions are that if you leave it alone, it will last longer.
Now I don't know much about Harley motorcycles in general nor anything about the engineering and design efforts put into the brand but any component that is subject to need replacing at 30,000 miles or replacing it early to make it last longer doesn't say much for it manufacturer.
Now for the 'ing.