Who has actualy had display fail? Not me, I have some from the 90's, still working great. Longer life is silly unless you are locking yourself in a bunker away from the world for the next 10 years.
It doesn't have to fail completely to be useless. If it's used for professional work, the backlight cannot change during the time like washout or get dimmer, inaccurate etc as that will make the work inaccurate as well and that is not what you want.
Lower power consumption, also silly. A few watts here and there, so what, nobody cares if it saves you 71 cents on your power bill over the course of a year.
Again, may not matter in home use but have an office full of them operating 40 hours a week. The few watts add up and it isn't only few watts anymore. Same for pollution.