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My answer is that we perceive rate of change but not absolute value. For example: there is far more usage of Uber today than 2014, but there was far more coverage of Uber then because it was new. In other words, we perceive the derivative of a sigmoidal happening process, but not the absolute value. Both the 0% and 100% states are perceived as 0%. So: nothing ever happens, because it happens so fast. And then it’s already happened. In most cases: coverage is proportional to the derivative, not the absolute value. Which means a space needs to sustain a high derivative for many years in order to be perceived as a continuous happening. Uber does 10X the trips nowadays, but it isn’t changing at the same rate.