GW is just trying to make the rules easier to understand so they won't have to write as many FAQ sections.
Unfortunatly with the advant of RAW and several poorly writen rules GW failed in their goal and took away from the game too.
That's why specialist games are so good. The rules designers weren't afraid to go nuts on the complicated rules.
(In Inquisitor you apparently need a calculator on occasion to work out all the dice modifiers)