Is it just me, or is basically most of this thread some flavor or other of "I'm not powerful enough to rule everything, every time?"
If they decrease the endurance usage rate, then some people are going to be helped. Probably, if the developers are really doing their jobs, some people will still run out. If people never ran out of endurance, then endurance wouldn't be meaningful, and should be removed from the game!
But, endurance is in the game, so it must have some function, it *must* run out for some people.
While it's annoying that Enhancement Diversification restricts some player choice (it restricts because it makes a certain slotting decision almost useless), the fact that you can make up for it, to some degree, by slotting differently makes up for it. In fact, my biggest problem with ED is that it's a little too arbitrary; its effects should be distributed smoothly across the range of possible improvement, instead of kicking in at certain levels.