This is why you never listen to those guys. (editing)
The thing about people who believe the skill curve should be like that is they don't realize not everyone will power through content if it is hard. Right now we have a lot of casuals and a few raiders; with this skill curve, we'd just end up with fewer casuals, and still few raiders; you'd just end up sifting out more people along the way instead of having two tiered endgame.
The problem with raiding is that it's mostly a hard endurance contest where one mistake can make the fight unrecoverable. After the clear, it becomes "do the endurance contest multiple times as fast as you can without mistakes" which is even worse. It's simply not fun content for a lot of people, and the devs pretty wisely keep it optional.Trying to push that model of content down the line would be a disaster.