RGB vs CMYK
jerryrock,
I'm surprised that as a graphic designer you haven't had any problems with your files once they reach the printer. Truth be told the printer converts all of your images from RGB to CMYK and then charges you or your company for doing it. Depending on the type of work you do, RGB to CMYK conversions can make a huge difference.
You said "The LCD monitor can not display the full CMYK color gamut."
Who said anything about what kind of monitor he has? Not everyone uses LCD monitors. Plus, in the end a printer does not print RGB images. The printing process uses CMYK, not RGB.
Yes there are some modern digital presses that can convert RGB images into CMYK but still in the end you have to have a CMYK image so why not do it right from the start. I have never seen a printer who says "we prefer RGB images". Most printers require CMYK images and if you send RGB images, they will charge you an extra fee to convert them to CMYK (which you should have done from the start). Even if the digital press can convert images from RGB to CMYK, most of the time their conversion isn't as good as what can be done in Photoshop.
Jim Campbell,
I completely agree with you. From reading your posts, I can tell that you are someone who has an intimate knowledge of things that many people have no idea about, like creep, impositions, and pagination. So many of the designers today have no clue what happens when their files get to the printer. A truly good designer knows and understands the printing process.