The basic question they ask is if it would be considered an exploit to bypass content in an instance by stealthing past it to get to the end boss.
Blizzard is clearly trying to keep people from bypassing content. Thus, it does bring to question if using stealth is acceptable in this case. Is it a skill designed for sneaking past a threat or is it a skill designed for sneaking up to a threat? Or both?
Personally, I have used stealth for both reasons. It is one of the main features of the class for me. I have snuck past a whole camp of minions to get to my main objective and then snuck back out. I also use it to sneak up on a threat in order to eliminate it.
It is my opinion that using stealth to bypass content in this manner is using the skill as intended. I do not think it is a cheap way of doing a quest either. There is risk, it is not guaranteed. I snuck through Shadowfang Keep one time to get to the end and it was a slow, challenging, risky process.
What do you think?