From the Encyclopedia Britannica:
Advantages of the plurality system are that it is easily understood by voters, provides a quick decision, and is more convenient and less costly to operate than other methods.
Because we want the foundation of our democracy to be based on a shoestring budget and a 30-second decision making process.
From an Chronicle of Higher Education article on the effects of the shutdown on research:
Farther afield, in Antarctica, scientists whose work was suspended got word from the National Science Foundation that the summer research season was a go. James R. Collins, a student at the Massachusetts Institute of Technology whose research was disrupted by the shutdown, reported in an e-mail that “everyone is running around setting up their labs” and would “move onto the ship this afternoon. We feel like we’ve been at the end of a very long yo-yo down here,” he wrote.
(I am updating the previous post to reflect this new information.)