excusing the quality comment, as there is not enough details (pun intended) on that and in my head im thinking similar to gigapixel type photos.
but assuming quality is not an issue, why wouldn't "any photographer worth his salt" care about this? No matter how skilled of a photographer you are, sometimes you miss that perfect focus due to various reasons. Or perhaps during your edits you realize it would have been so much better if focus was adjusted slightly.
a good photograph still requires a skilled photographer with an eye for composition, but this just helps make the capturing job one step easier to achieve what that photographer is seeing in his mind.