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People in a landscape should be like salt or pepper on a meal. They should simply enhance a bit, not dominate.
The shot with the handstand, or cartwheel for example, I really can't classify it in my mind as either a landscape or a people shot. It's just a picture of people walking on a beach. It's definitely not a landscape, your eyes don't know where to look. It may be a nice memory for them, but I think where people go astray is in convincing themselves that a picture of their friends, or a dog, improves the image. Usually it doesn't. It's typically more a step backwards to a "Kodak moment."
The people are way too dominant for a landscape, the mans leg is blurry, and the landscape doesn't have the "care" put into it that a nicely crafted landscape would have. Also, up close, kids are cute but adults usually aren't. Time of day, the sky, exposure, and general composition.
Of course it's all just my opinion at first impression. I don't know anything, I'll never put a person or a footprint in any of my landscape shots, it's just not my style.