If you have 5 core abilites, with 2-3 CDs that you use regularly in a boss fight. Adding 1 ability to this means 20% more. So in 5 expansions we have 100% more abilities to press than before. Of course, there are exceptions - I better mention this, since you straw man like crazy.
You should go back to "I dont have any arguments but there are threads out there with people who have just go and read them!"