Why doesn't my camera have a vivid blue or green?

I was corresponding with a long time photographer friend on Facebook, and he mentioned his Canon camera has a vivid blue and vivid green settings for nature and landscape photos

my D7100 has vivid but not vivid blue or green

any idea why Nikon would omit that?

It's rather pointless as it would only apply to jpg images processed in camera. It's better to shoot in raw (with no pre-sets) and post process to your liking.

Because it is fairly stupid and shouldn't be forced on the image in the camera - enhancement is fairly easy in post processing (Photoshop, etc.) There are more than enough choices on modern cameras that enhancing foliage isn't worth much.

That's exactly the kind of things that I find out before I buy a camera…

If it's something that really interests or annoys you then you obviously didn't do enough research.

In camera effects/presets are for shooting jpeg.

Most photographers, including amateur enthusiasts and professionals shoot RAW and are not interested in silly in-camera effects, or allowing the camera to process their images. Why did Canon add these? Probably to sell more cameras to gullible fauxtographers.

I own a fairly recent Canon EOS dSLR. I haven't used any of these effects once. I wouldn't even contemplate using them.

"… Long time photographer friend on Facebook…"

That tells me all I need to know, though I'm sure you do not know why.

Such settings are idiotic crutches for "photographers" who have no idea of what they are doing. A REAL photographer does not use and has no need for such inane nonsense. You should be GLAD your camera does not have such a setting.

Instead, learn how to take photos properly. Use RAW and if you feel some color adjustments need to be made to the original photo, then you do such things after the fact in the computer. That does not mean, however, that it is ok to raise color levels to the point that the scene looks more like a cartoon than an actual landscape photo.

I would be real curious to see the photos from this "Facebook photographer" who has to apply such amateurish nonsense to his photos with some automated camera settings. Well, actually I don't have to see the photos, I already know how they look.

In my experience most serious, experienced photographers who use SLRs don't use the presets. Why let the engineers in a lab decide what's best for your images? Presets are something for the point-and-shoot and camera phone crowd. I guess the camera companies put them in SLRs to appeal to the those folks. You know, the ones who want to "take their photography to the next level." People like your friend, no doubt. If you want to get a leg up on him, tell him that you only shoot in raw mode. But try to make it sound like you're not posturing.

I'll echo the other comments that this "preset" is essentially worthless to begin with.
But I'll also point out that Canon DSLRs have no such "preset."

They *do* have a "picture style" for "landscapes" that punches up blue & green saturation just a bit -- but that's not what your friend said.

Shoot RAW. Adjust color in post. That's how to get good color, not change the picture style in-camera and shoot JPGs.