I was talking about your personal jabs at certain users; in my opinion, a back and forth discussion/argument is fine.
Sure, but these "tiers" are slower to "update," and there is no real methodology to share this information beyond word of mouth. For example, NYU is still regarded as a pretty low-tier Manhattan school (look at its peer/residency director ratings, ask your friends who don't know much about medical schools) and is a tier below some of its Manhattan peers such as Columbia/Cornell. But now, on USN&R, it is above Cornell by a pretty significant margin and getting closer to Columbia - perhaps this is an early predictor of subsequent changes in these "tiers." And if not, it's at least interesting to view.
Also, some time ago, when my PI was in med school ~30 years ago, Einstein was considered to be a tier above Sinai. That has clearly changed. But I bet if you looked at the USN&R rankings (if they even published data at that time), it showed this change a lot sooner than the tier rankings in our heads. Things like sudden huge donations (such as what was given by Carl Icahn to Mt. Sinai) that can be used to poach big names with lots of NIH funding aren't really updated in people's heads but they are quickly updated in the USN&R rankings.
I'm not saying that USN&R is the best metric to use, but I do think that it is certainly useful, especially when you consider the trajectories that certain schools have taken on it. Pedigree is important, especially in academia. I bet those people who chose to go to UPenn a couple decades ago are patting themselves on the back. I bet those people who chose to go to Sinai a couple decades ago are patting themselves on the back. I bet those people who chose to go to NYU less than a decade ago are pretty pleased so far