A key short-term boost for stocks has vanished for the first time in 17 years

Traders have not been this unresponsive to earnings announcements in nearly two decades. 
The rate of earnings beats in the second quarter is above its five-year average, at 73% of S&P 500 companies that reported through Friday according to FactSet. Corporate America is also giving less negative guidance about the third quarter than usual.
But this kind of topline earnings performance is not impressing Wall Street and moving the market like it used to. For the first time in 17