It has more to do with their opinion of the general gaming population.
1) Most people have pea-brains - Can't comprehend more complex systems.
2) Most people are lazy - Won't level up other classes for abilities.

In 1.0, we had to level gathering and crafting to gain extra stats for combat classes. Makes very good common sense, but people bitched non-stop.
The RNG skillups didn't help though lol...