Couldnt agree more, and ive come across cases of exactly that where we hit an rpm/load site and the fuel is absolutely MILES Away from where id expect it to be.

In fact, ive seen it some 150% away from any neighbouring load/rpm site so it was impossible to get correct as the ecu's resolution didnt allow it

Interpolation "IMO" is only acceptable for an engine that is nowhere near its performance potential and therefore rather "flat, lazy and safe" if that makes any sense at all?