OT: Why is the way yardage is calculated for Field Goals and Punts different?

So for Field Goals, they calculate the distance based on where the holder is and then add the 10 yards due to the uprights being in the back of the endzone. But then for punting they calculate the distance a punt goes based on how far from the line of scrimmage it reaches, not from where the punter actually kicked it.

I know that at this point it wouldn't be a good idea to change this, since it would make previous kicking records hard to compare to kicking stats after the change. But my question is why is it done like this in the first place? Why wasn't it decided to calculate punt distance based on where the punter is when he kicks it, or to calculate field goals based on where the line of scrimmage is? I feel like its unfair to have stats say that a kicker kicks a 50 yard field goal but a punter punts it approximately 60 yards but official stat keeping says he only punted it 48 ish yards.