lol, but believe me NV is very needed.
without NV everyone will change ability like as they want. this why they create NV.
if u find hard elite pack u will change ability; find other elites u will change again. even if u want to kill boss u will change again. believe me there is no enjoy for playing game like that.
I completely disagree with your reasoning, while I agree NV is good in ways, though.
While personally I would mostly relish the challenge of beating anything in front of me with my preferred build, the one I enjoy. Choice and diversity are good.
Here's the thing...
These forums are full of QQ, every day another thread appears whining about some mechanic. We have seen them all and will carry on seeing them, Invul minions, RD (current known bugs accepted), goblin HP in high MPs, and on and on.
There are solutions to all the QQ in the skills we have available, but people will dismiss that as 'being required to use a mandatory skill'.
If we were allowed to swap skills for different situations without losing NV, those who wanted to remain with a certain skill set and take the challenge, can do. Those who want to swap to a high dps long cd skill, can do. Those who want to swap to a life return skill or passive, can do.
This would result in less QQ, or at least less QQ that would easily dismiss offered solutions from skills. It would result in less things being removed from the game, less dumbing down, less homogenizing. Hell, it could even result in the game evolving more in the other direction and throwing stuff at us that requires us to actually use different skills.