Buyside v. Sellside Trader Adversarial potential, important, electronic, especially

Zesty

From Schweser...

"Brokerage commissions have fallen dramatically. The temptation is to shift costs to those that are implicit, rather than explicit. Thus, trading between buy-side and sell-side traders is becoming more adversarial. Furthermore, the disclosure of information in a trade can be used against a trader later on, especially with the advent of electronic trading venues where trader identity can be kept confidential. Thus, trust has become more important given the potential negative ramifications of trading with an unscrupulous trader."

Anybody care to summarize this in plain language? I don't understand how the cost shifting makes the relationship become more adversarial.

Thanks in advance.