What about getting 25 ppl with a good internet together at the same time? And what make you think 10 man raid doesn't have the other ppl sitting outside the instance waiting to be rotated in? Many 10 man raids have 11-14 players as a main raider so it's just the same. They wiped for 32 attemps more because they have to adjust the new positioning, new healing way, adds managing, etc.
What you should think in comparing 10 and 25 man is not only about the difficulty, but also another factors like teamwork and stability of internet. People gives more credit to 25 man raiding because it needs *a lot more* of those additional factors than 10 man.
My friend is a member of 10 man raiding guild and sometimes it's very annoying to listen to them moarning about how hard 10 man is over 25 man, how unfair it is when it comes to loots, how hard it is when only 1 ppl didnt show up and they cant raid at all. Well I bet he never think about the same problem in 25 man, 25 ppl, 25 lives, 25 stories, 25 internet connections and computers. This can go on and on forever.
I'm gald Paragon kill this on 10 man. IMO they just do it to prove that the boss is killable and not overtuned in 10 man as some random ppl used to said.
And lets face it, many 10 man raiding guild choose to raid as a 10 man because it is impossible for them to find 25 ppl with proper connection, skills, and gears. As I've said, it's not only about the tune or difficulty but about the other factors. Some bosses will be a lot easier in 25 than 10 and some will be a lot harder in 25 than in 10.