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K. I. S. S. means keep it simple stupid. Sellers lie to you by giving you the easiest info so you'll be dumb enough to buy it.
"This phone is the best ever! It only has 1 button!", from a guy who sells broken calculators.
"This car goes 10 mph. That’s all you need!", said the guy who drove it into a ditch.
"This app is so easy, even your grandma could use it!", but your grandma still uses a flip phone.