If there are already problems with how federal contracts are awarded, it is hard to imagine that wholesale deregulation is going to result in a more selective process. For example, blind removal of lowest-bidder requirements would make larger-scale corruption even easier.
There are legitimate complaints and federal contracting needs work, but what kind of work? Let's not underestimate how much worse we can make it. The money on the table is ample incentive for people to propose innocent-sounding reforms which really just open up the taps or redirect them to different parties rather than increasing efficiency.