Nerfing the raid mid-tier, whether planned or unplanned, interferes with the current progression of all guilds that are progressing the raid. This is just a fact. I'm just articulating my opinion that this has the potential to alienate those players, based on the sources of information available to me: personal experience on Onyxia and previous Frostmourne servers, the experience of players in my guild and other players that I speak with, and reading this forum thread and similar where players are unhappy about the way Sunwell nerfs were implemented. It's not a huge leap to make that players on a progression-focused server would rather their progression was not interfered with. Not really sure what an argument with some "density" in it is supposed to look like.
I'm not trying to play for one team or the other here, I genuinely think that the Sunwell nerfs were poorly implemented and think it would be to the detriment of the server as a whole if it became a pattern in wotlk. If there are players out there think the nerfs were implemented well and are very happy that they can now complete the content then I would definitely take that into account, but it definitely seems to be the opposite side that is more vocal.
While it's not possible to know how every guild on the server feels about the nerfs, we can definitely determine how many guilds' progression was impacted by the nerfs. It was every guild on the server that entered Sunwell, but didn't kill Kil'jaeden pre-nerf. That's every guild except two, which is definitely could not be considered a niche or minority of players. I just think the devs should be very careful about taking actions that impact a group of players that large without having an idea on what those players would prefer - all I can realistically do to aid that is to give my opinion here.
And while yes, players could always compensate for nerfs by handicapping themselves, I don't think it's unreasonable to suggest that the vast majority of players would prefer if the devs would just give them an experience they desire instead of having to create their own.

