Chris is right! The older "real" printers use the color proofs that clients sign off on as the benchmark so to speak to match the final printout so that the colors are as close as possible to what has been produced by the color-separated negs to make those printing plates to print from; of course these days the Y-Gen printers have DTP (direct-to-plate) and now DTP (direct-to-press) technology to work with
With the CMYK printing process one is limited to how much "gain" you can have with the dots-per-inch mechanical resolution of the printing presses as well as the limitations of the paper stock that it is being printed on; it can only have so much ink on it (bearing in mind that the CMYK print process uses 4 colored dots to make the full color image) before it saturates physically with the inks!
Adobe was the pioneer in DTP (desktop publishing) and had everyone using their "standards" that they set long time ago and thus became the industry's defacto standard; and in the early days the Mac was the platform that you use if you are into DTP (even today the majority of graphic designers use the Mac - although I might be mistaken - the PC is still playing catch-up in this regards) and the pre-press workflow was mostly influenced by Adobe "standards".
When digital photography progressed to what it is today, Adobe still rulz and in order to use your digitally captured image to print media you would of course use Adobe RGB rather than sRGB which is more for the digital world of PCs and monitors
Cheers
Bill
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