They're terrible for landscapes... (31mm Limited, Valley of Fire State Park, Nevada)
Just awful... (31mm Limited, Meadowlark Botanical Gardens, Vienna, VA)
No redeeming value whatsoever... (77mm Limited, Mule Ears, Big Bend National Park, TX)
Just utter drek... (77mm Limited, Artist's Drive, Death Valley National Park)
I'm not sure where your "not good for landscapes/not often used for landscapes" is coming from. My 31mm Limited sees very heavy use as a landscape lens, and I think it's fantastic. I literally have nothing bad to say about it. The 77mm is also an excellent landscape lens, but it's rarer to find subjects that fit that field of view. What's not to like? They're relatively small and easy to carry around so they always come hiking with me, I never have to worry about the build quality, their sharpness is excellent from f/4.0 onwards, and I can't ever remember having problems with flare, vignetting, or aberrations. Most of my photography is landscapes and I can't imagine what life would be like without the 31mm Limited.