In addition to the 2021 thread mentioned in those quotations, Anoek published a summary analysis of using overall ranks to predict different speed and sizes in this rating update thread.
I don’t have the statistical skills to deeply analyze any of it, but I feel there should be some matchmaking consideration for people whose skills on on board/size deviate far enough from their overall. Perhaps if a player’s overall and category rank are statistically different and the category rank meets some standard deviation criteria (is it firm enough) matchmaker could use some formula to blend the ranks.