Well, it seems I was wrong, for in the very next tier of content Blizzard released, we saw progressive nerfs to these difficult fights. Personally, I prefer to keep these encounters the way they are, at least until a new tier is released. Something just feels wrong to see the hardest fights available made easier through a series of hotfixes. Even with respect to my own guild's progression, having sweeping nerfs hit Firelands just as my guild was putting in some really good attempts on Ragnaros felt like Blizzard moved the finish line, taking what would have been a very gratifying kill and turning it into an accidental one-shot that contained none of the catharsis we had felt during previous boss kills.
What do you think? With the Raid Finder now a reality and a new expansion looming on the horizon, do you think the difficulty of heroic raid encounters should be static, like those from tier 11, or should they be more flexible?