Why should digital SLR photography be sharpened later?

In the later stage of digital SLR photography, it is generally because the sharpness of the photos is not enough and the clarity is not enough. In fact, really good photos will not be sharpened later. By careful comparison, we can know that the sharpness of direct shooting is soft, while the sharpness obtained by post-sharpening is stiff. At the beginning of photography, I also sharpened every photo, gradually, sharpening less and less, and the degree became lighter and lighter.

I hope to adopt.