Apples and Oranges - a foul is not an inherently "two-part" offence like offside, where one part occurs first (player in offside position) and you then wait for some time for the player to become active (which could be almost immediate but could equally be some seconds later) by which time the player could have moved as much 50 yards or more. A foul is also not an offence for which the location on the field has been decided based on one set of perfectly good criteria for over 100 years and has just suddenly been moved to a completely different (and to my mind, much less logical) location based purely on a desire for that "hobgoblin of little minds" - a foolish consistency.
The whole idea of offside is to prevent a player gaining an unfair advantage in terms of attacking play by getting closer to the opponent's goal than he should. Why then should it be penalised by a free kick back towards the player's own end of the field? To me, it just doesn't tie in with what many would see as the "Spirit of the Game" as it applies to offside offences.
