Frequent Live View use can add wear compared with normal optical-viewfinder shooting, because on a DSLR the shutter mechanism is involved when entering or using Live View. That means it may contribute to the shutter’s total actuation count and could, in principle, shorten shutter life somewhat.

That said, in practice this usually isn’t something to worry about much. Shutters are designed to be used, and most photographers are unlikely to hit the rated lifespan quickly unless they shoot very heavily. If the camera needs Live View for accurate manual focus, it makes sense to use it.

Also, shutter mechanisms can be repaired or replaced if they eventually fail. So yes, Live View may increase mechanical wear somewhat, but the practical advice is: use the feature when it helps you get the shot.