As Tom Paul said the best explantion of why OB
and lost ball have to be replayed is in Richard Tuft's
book. I'd recommend it for all those who want to change
rules. But, if I could change one rule (actually it changes
the entire book), I would elminate Rule 3 - Stroke Play and
all other references to stroke play in the rules of golf.
Lets just go back to match play all the time. Think of all
the neat things that could be done architecturally if you
didn't have to worry about being "fair" to the stroke
play golfer.
As for fixing spike marks and divots being ground under
repair, get over it, play the ball as it lies and quit
whining like a tour player.