The main point of contention seems to be that there are a lot of packages being selected by default, and to deselect everything you have to scroll way down an already long page or to click tiny buttons blending with the other elements, while the design of a site as a whole tries to railroad into clicking the large Next -> Next -> Pay buttons. Plus, the design of various packages differs a lot, so for deselecting, say, paid seat selection, extra in-flight meals and a premium lounge the user has to read the info in a completely different layout, understand it, and find a well-hidden place to click on.

The final price could be representative of what you've chosen, but the whole process creates massive anxiety over forgetting to deselect something somewhere and paying for a completely useless to you option.