Why I voted 'no':
I feel invisibility (spell, item and potion) is weak enough already (intrinsic invisibility is probably the opposite). If it continues to be nerfed it will end up not being useful. Sneaking into the air temple and cutting out it's 'heart' (Yuglash) feels very thematically clever to me, and I'd hate to see it go. I find it quite poignant that invisibility can be used to conquer the air temple! It's kind of like using magic to clear the mana temple - I always felt that perhaps magic would work really well in such an elemental heart of magic, and similarly can imagine 'air magic' being effective in the air temple - it feels like the right place for invisibility to work, for me.
Moreover, though, one of the things I like about ADOM is the fact that a player can feel that she is overcoming 20-foot tall demonic dragon beasts by using mortal intelligence or trickery. Metaphorically throwing sand in their eyes is, to me, both more fun and more believable, than overcoming every adversary by overpowering them. it's also better as a legend. I find Prometheus tricking the gods, Hercules cauterising the heads from the lernaean hydra, Perseus using a reflection to negate the power of Medusa, or Theseus' 'ball-of-wool trick' in the labyrinth, far more compelling stories specifically for their cleverness/trickery.
Hell, the very term 'Achilles heel' came directly from the notion of every great mythic adversary having weaknesses.
Not to mention, if I wanted to grind my way to power in a roleplaying game, I'd play world of warcraft or diablo.
In short, the more 'clever tricks' that are removed from ADOM, the more it resembles every other snooze-fest grindy RPG on the market, and that to me is the very antithesis to everything ADOM stands for.
This is, to note, the same reason I voted against the removal of boss weaknesses months ago, the same reason I voted against a nerf to potions of cure poison on the snake from beyond, and the same reason I voted against normalising monster danger distribution (that is, I'd rather face an ogre magus early and have to figure out intelligently how to get out alive, than to have a smooth grind from rat to balor followed by a victory message)