I have no issue with a window. The institution cares more about liquidity being reasonably deep than executing in a nanosecond. There's always going to be a si

I have no issue with a window. The institution cares more about liquidity being reasonably deep than executing in a nanosecond. There's always going to be a situation where a market maker on a 'floor' has an edge in analyzing short-term flow and setting a market-clearing price second by second, and a big upstairs institution has an edge in size and longer-term analysis, and the upstairs guy is paying something for liquidity. I don't think the market-maker is providing 0 value, but probably better if less energy gets spent on guessing what everyone else is doing and spy vs. spy gaming the system, and the more level and transparent the playing field is the better.