An assumption by its very nature is invalid. In a simplification of the problem something is lost. If people act close enough to being rational in a certain situation then the assumption of rationality may be appropriate when modeling the situation. If someone is addressing information regulation then assumptions about rationality have to be altered. By the same token a macroeconomic model may be approached by assuming that people have infinite lives because they don’t all die at once and they care about the welfare of the children. When examining something pertaining to social security this assumption is absolutely ridiculous.

Perhaps it may be advisable to learn something about the discipline you are criticizing before you make baseless claims. Even applied economists don't do things in a way that resembles what you talked about and they are in a naive sense the "curve fitters" among economists. Your name implies you place some value on some higher form of awareness. Perhaps it may be beneficial to realize that most disciplines have been challenged by people who are at least equal in intellect to you and who have far more knowledgeable in the subject.

You mean things like using a general functional form and dynamic programming?

There is really nothing special about the articles about economic theory. Articles of this complexity commonly grace theory journals.