Even his uncovered is an ideal situation, most do not place wood in middle of open field. IME most is shoved too a property line or fence. This causes leaves dirt and debris (especially pine needles) to sit on top causing rot. Also weeds and grass lower the quality of bottom rows..
Agreed 100%, I might not top cover AS much if I had the ability to stack in a wide open flat field like that with all that sunshine and air flow. This^ who was I kidding with my initial response