I have been 13/13h for months.
I raid 25m
Im in HUNKS on Benediction.
If the average hit on 10m like you said for whatever you looked at thats what im saying, no one is at risk of dying.
If an ability goes out and it hits the raid for 50k but on 10m it hits for 40k the 10m team is far less in danger because the ability doesnt hit as hard, the amount of healers is irrelevant.
Then you have 10m kills which are much faster than 25m kills because even taking into account the +15 players 25m has the amount of HP is so much more, like +255% for Alakir like i said.
10m Boss mechanics hit for far less and the bosses have far less hp.
Which is hwy you can have random 10m guilds have much faster kill times then the sweatiest and best guild in classic that runs 25m like Progress
The world first guild back then even did a comparisson because they were world first in 10m and 25m in firelands.
The points they make are the same points im making on why 25m is harder.
Thats also MY mage. I also play a shaman tho cuz our ele had a baby, so i have been playing the shaman (Peeposcam).