It's not merely the raid as a whole is easier for today's seasoned wow classic gold players.
"As for pre-nerf C'Thun, there's absolutely no doubt in anyone's mind that against the meme which came from 2006 IRC logs, pre-nerf C'Thun is absolutely not mathematically impossible. Players are doing triple or even quadruple the quantities of people's DPS back then so even a pre-nerf C'Thun would easily fall. It's a matter of the playerbase being more skilled, and knowledgeable.
When you look at the harm logs of almost any C'Thun kill right now you can see that is true. You've got players performing between 200 to 300 dps on bosses, and since this can be Classic WoW you understand they are watching a movie on their second screen while they perform it. It is tough to find precise numbers, as most people weren't keeping tabs on dps 15 decades back, but based on Minmaxed, it had been much less than what we are seeing now:"[There is ] a general consensus among people who did play back is that it was'way less' The idea that pre-nerf C'Thun is too high of a harm check is laughable."
Practised on our client for several weeks until it went live, developing plans and getting knowledgeable about the trash and experiences," Minmaxed explained. "I believe most of cheap classic gold wow the guild would have enjoyed C'Thun to be more difficult, but when talking about the whole'mathematically impossible' C'Thun I do not necessarily think it was as much about maths because it was about the experience being calmed with tentacles spawning inside of walls and beaming your raid while being out of line of sight"