> An employer is looking to screen two recent harvard grads by GPA, not really between a new grad and a 5/10 year ago grad.that's a really good point, actually. in every situation i can think of where someone is looking at your grade (always admission to the next step in the ladder, in whatever form), you are being compared to people "from the same time" as you.
and i'd like to reiterate how difficult it would be to have a "stable" standard of mastery, no matter how nice. technical fields change a lot, and fast, these days. all across STEM, in 20 years everything changes. everything's so niche, as well, sometimes it may be hard to compare two degrees with the same name of different institutions. maybe we could do it with the fundamentals (mathematics and physics)? but look at a textbook from 100 years ago (say, Whittaker and Watson) and you'll find that even this changes. and even if the field doesn't change, the world does: i'm imagining how old-timers could claim that in their time information wasn't so easily accessible.