I think the grand parent sees root as a risk 'cause it introduces additional level of complexity which could contain potential exploits. Superuser app is not bulletproof and may contain bugs. There is also a human factor. How many of us managed to dismiss a dialog box without actually reading them? I know I did not because I click everything, but because those thing may popup at most inconvenient time, when you want to click on something else.
To keep root or not to keep depends on users' needs. I just wanted to point out that it is not necessary to keep it once the job is done and it is no longer required.
"Live is a disease, with a 100% mortality rate."
I've never sad there were too many 3D printer articles. I said I was tired of 3D printed guns articles. So what if they fire? there already have been guns that fire. It is neither news nor achievement. Those guns are simple technology. Anything special about them are that they make of plastic that may explode in your hands.
On the side note I have never used the word "slashvertisement". Nor do I get too irritated over the persons trying to spread the word about their product on Slashdot if it is compelling to the crowd.
And finally "ZERO" does not fit the criteria to be an answer to either my or your questions.