They also change because of (1) how cheap things have become and (2) how easy it is to iterate. If I paid $500k for an app from a good dev team, I will worry that anything I don't declare a bug won't ever get fixed, or will cost me dearly. If I get the same app for $300 in tokens and 2 days of someone's work, I am fine with what I am not sure about. It will cost me next to nothing to keep iterating it until I am satisfied.