They tend to plan out stuff ahead of time, it's not possible to take every suggestion into consideration, or you can imagine the mess that would ensure. But what people don't understand is that just because your personal idea was not taken into account does not mean they don't listen.

If someone says its a good idea to put Mayonnaise on ice cream it may seem like a good idea to you but majority of people including the people who make ice cream would probably vomit at the thought.