Increasing movement speed can disrupt player rhythm as well.
For example, I've actually had the slight increase in movement speed on NIN screw me a couple times since I'm used to running on other classes. If everyone's suddenly running faster, then that can cause more problems than it solves.
Echo is an anti-frustration factor to ensure people who may not be able to handle certain mechanics are able to beat a fight.
For example, some people are capable of clearing t9 and beyond yet still get hit by titan's weights. They are NOT "lesser players" for being unable to do so, though.