[cbutner]

I agree with what you're saying. On the flip side, there are multiple systems (Elo, Glicko), anchors, playing pools, etc. in use around the place, and FIDE and CCRL are offset by around 80 magnitude I heard, compared to about 600-700 difference between top humans and top engines.

So for a non-technical audience, I feel like it's easier to give a ballpark that they can understand without having to pull in too much context around Stockfish, CCRL, etc. It may have been better to clarify further in the docs though.

The "Data" document does give the relative Elo breakdown in the appendices.