First, I recall reading that if you shoot in RAW, it's going to require in sharpening. I wish I could remember the explanation for why this is so. My RAW files are NEF and I convert usually in Affinity Photo. So I don't believe my software automatically sharpens in RAW. But I absolutely notice a difference when I sharpen (or don't) with my RAW conversion.
Second, I think people are assuming that if your focus is good, your lens is calibrated, and your lens is sharp, your digital image will therefore be sharp. Not so. That body and lens and focus only creates a mass of digital data. Which your photo program then says "okay shooter, here it is--do with this what you will!"
I know that the literature I've seen has typically said to hold off sharpening until the end of your edits so it doesn't create "artifacts" in your image.
As to the questions about "how much to sharpen"--I think that's a function of so many variables (the look you're going for, the software you're using, if you shot RAW or jpeg) that it's impossible to say across the board for all or most photos and all or most programs.