I had a call-back regarding an inspection I did months ago. A Contractor looked at the roof recently and said that the life-span of the roof has been significantly reduced due to the butt joints of the shingles lining up every second row (please see pics attached). The shingles line up every second row fairly consistently through-out the roof.
It is my understanding that this (racking) is an aesthetic issue only not a performance or a life-reducing installation. What is your recommendation and or opinion. Thank you.