I don't get why this seems like a big deal or a negative thing. Why wouldn't you want reporters to be critical? Isn't that like the whole point. That's even why we have freedom of press in the 1st amendment, so journalists can be critical.
Yes and no, it's important to have critical reporting, but imagine say that all reporting on medicine could only be critical, no articles about breakthroughs in cancer treatment or curing disease, all malpractice and ballooning costs. That wouldn't be wrong, but it'd be incomplete?
"Critical" in the pop sense (making a worthiness judgement) is not altogether avoidable, but it should be marginal in journalism. This is what Opinion is for.
What Yglesias & Piper are saying, in effect, is that the NYT made a top-down directive that tech coverage should be negatively-slanted Opinion.