Interfaces are not necessarily supposed to make things easier, they're supposed to allow the user to achieve things that they otherwise could not do (there is no easing of "can't do it") or that they otherwise had to exert decidedly more effort in attaining results than the effort of learning the interface (there is an easing, but it's tied to the cost of change/learning). If you can't meet the bar of those criteria you should always revert to the principle of least surprise.
"I am able to do X." "It is now easier for you to be able to do X." "I am unable to do X." "It is now easier for you to be unable to do X." The latter makes no sense. Moving from the impossible to the possible isn't an easing, it's a fundamental change in the nature of a thing.
Depends on your definitions, I guess. If you define "easier" as "decreases the difficulty of doing X" then it makes sense as you've reduced an infinite difficulty down to a finite difficulty.
Note you changed the nature of the problem by turning "infinite difficulty" into "finite difficulty." Subtract all the difficulty you want from "infinite" and you still end up with infinite, unless of course you subtract infinite difficulty from it... which means you qualitatively changed it from infinite difficulty to merely difficult.
