20 is a number.
Most content people are nostalgic about was a set raid size (MC - SWP)
10n - 10h - 25n - 25h was the same content in 4 difficulties.
lfr - normal - heroic - mythic is same content in 4 difficulties, but can be balanced.
and since they don't share lockouts, I'm looking at possibly having groups for each difficulty type.
mythic with folks I miss when they're gone in heroics.
heroic with the 'farm group' i see now in 25s.
normal with whoever i feel like bringing.
lfr to catch up alts and get satchels etc.
I miss Lore :( two ten man guilds could do the mystic raids together maybe?