Blizzard = Company = Company's want highest profit
Allright we get that ?
Casuals = 90 % Of WoW population
Hardcore = 10 % of WoW population
See the link ? They make the casuals happy since they want more casuals & hold those casuals, instead of those "10"% harcore guys.
They don't care about the game, believe me. You can't blame them for it, but you shouldn't expect them to make the game better for you if that can cost them money