The reality is that everything in all the engines on this site is performed through percentages married to an RNG, so yes, thinking of it terms of FG%, or 3%, or TO%, or the percentage of time a shot is a 2 or a 3, or the % of times a shooter is fouled, etc., is more truthful to the inner workings of the engine than trying to estimate what a player's relative rating equivalents might be as IQ changes. That said, as coaches, typically we're trying to make lineup decisions between players, so it's still useful to be able to spitball what the relative "ratings value" of IQ is to make quick and correct depth chart and distribution choices.