It's different for different parts of the business of course, but the graphic designers I know personally (through a family member) don't care about monitor gamut or colour fidelity at all. Sounds odd, perhaps, but there's good reason for it.
Most graphic design is not for the web, but for physical objects. Anything you see around you that's printed or patterned - kitchen utensils, tools, and household objets; clothes and textile prints; books, calendars, pamphlets; not to mention the cardboard and plastic boxes it all came in - has been designed by a graphic designer. And it's all printed using different kind of processes, on different materials, with different kinds of inks and dyes.
A monitor, any monitor, simply can't show you what the finished design will look like, since it can't replicate the effect of the particular ink and material combination you're going to use. So they don't even try. Instead they do the design on the computer, but choose the precise colour and material combination by Pantone patches. We've got shelves of sample binders at home, with all kinds of colour and material combinations for reference. As an added bonus you can take samples into different light conditions and see what they look like there.
The finished design is usually sent off as a set of monochrome layers, with an accompanying specification on what Pantone colour each layer should use. They do make a colour version of it too, but that's just to give the client a rough idea of what the design will look like.