HS, I am just finishing up my print class and before this class started, I was with you 100%, especially with the luminance issue. My prints always came out darker than what I saw on the screen. However, now that I am at the end of the class I know now that its all a matter of getting the print right, which is all about finding the proper ICC profile for the printer you are using. This all digitally speaking of course. I cannot speak about darkroom printing from personal experience but have heard that prints created in the darkroom always look better than how the image looks online. I know this is true with my gum prints.
But anyway, after my class my prints now match what I see on the screen exactly. I cant tell that the prints look better, just that they look exactly how they do on screen. If you want to go over ICC profiles, I mean if you arent very familiar with that, I'd be more than happy to talk to you about what I learned in class. Its not a whole lot of info but its helped me create proper digital prints.