Re
Norfleet,
Yep, invisible mages can be hell. That is why when they show up, our party mage and cleric have spells ready to counter invisibility.
Witch Doctor,
Our gaming group finds applying "realism" to D&D actions entertaining. Some don't, that is why they follow the rules precisely. They have different tastes.
Some folks even come to different conclusions based upon their own analysis.
My main point is that people should be thinking why they are playing. Visualizing the environment they are in and attempting to ascertain how things would work, then apply necessary rules changes based upon their visual analysis of how something could be pulled off. I often make my players explain how they are doing something so I can visualize them doing it rather than let them do it because the rules say so. This is how I like to play.
I find it utterly boring when someone appliles the rules with no thought given to how the attack might look visually. Makes the game less fun and the combats less interesting. If I wanted to be limited by a rulesbook, I would stick with video games and board games. This is an RPG , it uses the most powerful creative tool in all of creation, the mind.