In order for a person to like a product he needs to go through its learning curve to be able to use it. If the learning curve is short then more people might like the product.
People are already bombarded with tons of products and features, which is why a product that is easier to understand puts less load on the already loaded human brain.
Studies have shown that the attention span of humans was greatly reduced. People can no longer give a long period of time to a new product. People usually get bored fast, so if the product didn't catch their attention in a short period of time they might not have the patience to use it.
Most people prefer the shorter path over the longer one. The faster a person can use a product, the more likely the product will appeal to that person. Instagram succeeded when Facebook was already there because it allowed people to upload their pictures fast.
Not every person will have the patience to learn about the complex product, which is why the simple product usually appeals to a broader range of audience.
Steve jobs removed all the buttons from the traditional smart phone when he created the iPhone. One of the reasons the iPhone succeeded is that the phone looked much better without the distractions -in the form of buttons- the other phones had.
The human brain is a very energy intensive organ, which is why it does its best to avoid spending energy when it's not really needed. This is why the human brain prefers simple products.
Most people are not patient enough, which is why a complex product that wastes a lot of time might not be embraced by the general public. Most people will prefer the simple quick solution over the complex long one.
According to a study, people feel better when they do a task that doesn't require much mental effort.
As the pace of life is becoming faster, most people don't have the free time to explore the complexity of a new product or to waste time until the product works.
Not all people are smart enough to figure out how a complex product works. This is why a simple product might appeal to a much larger group of people.