Ahh Sarth 3D, the one and only 10-man content that was difficult, until you could zerg it of course, then it was just plain silly.

Mechanics can make certain encounters more difficult depending on raid size, that's just how it goes. Sarth 3D just happened to be one of those. Using a single instance where mechanic design played against a particular raid size as evidence against the truth isn't a solid argument.

10-mans were easier than 25-mans in Wrath. They were this way because Blizzard made them that way.

"When you were a strict 10-man guild, using only 10-man gear...10mans were plenty difficult."

Indeed they were, because that was the design intent. Yet, there was little reason to do this other than if you were a strict 10-man guild.

Although it's nice to appreciate and respect those guilds that were strict 10's back in Wrath, there simply isn't any means by which they can be legitimized. 10-man content was designed to be easier than 25-man content. It was easier than 25-man content, even for pure 10-man guilds.