I know, what I was expressing was:

an increase of X ELO points doesn't have a significant meaning, as an increase of points from 1000 to 1200, would be very different from an increase of points from 1500 to 1700, and very different to an increase of points from 2800 to 3000.

There's a million ways a player or an engine can go from 1000 to 1200. But whatever tactic or change would make a player go from 1000 to 1200, could easily cause a 2800 player/engine go to 2750 or 2400 or... 1200.

This doesn't handle rock-paper-scissors-type strategy matchups, but at that level of detail, 1000 to 1200 is not the same as (a different) 1000 to 1200.