Whether it is stupid, even if we're just going to assume such a thing can be viewed objectively, is beside the point.
If you think it is stupid, don't use it. If you want your money back because you bought something that you didn't properly research, why not ask for it instead of whining about it on your blog?
And, on the point of Apple not advertising 'unfeatures' (I like that term), we, as consumers, make decisions in these situations about how much we're willing to research different investments ahead of time. Likely, for most, an OS is not something to research in depth when it's only $20. But it's only $20. Downgrade if you hate it so much. Live in the past. But don't claim you feel violated... when you made the decision. She violated herself if anything.