Well...some people know how to make excellent prints, some people don't (but are still willing to write books about printing). I know what I know...ya know?
I know that soft proofing is an excellent (but not perfect) tool for helping to extract the maximum image quality of my digital captures.
If that is important; capture to print, then I'm inclined to leave nothing on the table. I know how to soft proof, I also know a bit about image sharpening...if you want the best, optimized images for final ink jet printing then you need to take a couple of steps to make sure you get the best you can get from your images.
If the "best" isn't important, you can omit a few steps and accept what you get after doing a proof print and twiddling a couple of adjustments. Is is the best potential outcome? No way...is it "good enough"? Probably for many people. Not for me.
I all depends on your expectations...do you want the best output? If the answer is yes, then why would you ever leave a stone unturned?
I think it boils down to expectations...my expectations are pretty high. Not everybody has those expectations...to say it bluntly, some people accept far less than what I would accept in final printed form. Like I said, I'm a pretty good printer...not everybody has those high expectations. I do.