Why did Charles Schwab criticize the New York Stock Exchange?

Could you please elaborate on the reasons behind Charles Schwab's criticism of the New York Stock Exchange? Was it due to concerns over market manipulation, lack of transparency, or perhaps issues with trading fees and regulations? It would be interesting to understand the specific grievances Schwab had and how they impacted his business or the overall investment community. Could you also discuss any potential consequences or changes that resulted from his criticism?