Perhaps some journals only let grade "A" papers pass, but sometimes that same journal has an editor who might let their buddy's article slip through. If one is part of the old boys club, this is a nice situation.
What eLife wants are signed grades from editors and reviewers. The editor is supposed to attach a brief summary in a few sentences summarizing the reviews. Hopefully one might bother to read a sentence or two to evaluate a paper instead of merely looking at the cover of the journal.
eLife's move here is basically a statement that the system is corrupt. Those wanting to fight the corruption are trying to increase transparency and reduce arbitrary decisions.
> with a short editorial assessment of the work’s significance and rigour
However, not getting the stamp of approval will no longer lead to the work not being accessible to people.
Would it? You'd think that a hiring manager would rather see a description of what the student accomplished, and with what level of skill, rather than a rather opaque letter grade.
Of course, that would make it tough to run "cattle car" courses with thousands of students being graded with multiple-choice tests. I don't think that would be a bad thing, either.