"With concerns being raised about the deal's impacts on everything from intellectual property rights to government sovereignty, it is surprising to many that Congress would abdicate their role in determining the specifics of agreements that may have far reaching implications for their constituents."
Why is it surprising? Gives them less work to do! They're all pro-business, which is the reason they're in office. Whether or not they agree with tighter gun laws, or minimum wage, or black/gay rights, or abortion, or equality of any sort etc...those aren't interesting to people in power other than as something they can use to sway voting voters on any given election. These people don't give a fuck about you in any other way, and in any case, stuff like copyright etc is just not of interest to most people; there's simply no votes in it.