Sry the thing you linked is bullshit, over simplification : sure there are more mechanics as a whole, but you as a player don't need to know all of them.
if you are explaining every single mechanics to every single raider, then yes you are doing it wrong and wasting time and confusing everyone.
For each role (tank / DPS / healer)
theres only like 1 MAYBE 2 mechanics per fight you need to handle.
In the past tiers, all mechanics affected everyone, and there was a lot more coordination (releasing whelps, playing turrets, blackouts ...)
On horridon for example, you just focus on your individual task and all is fine :
healers watch triple punture and dispell
dps nuke : bigg ad > small add > boss
tank : tank boss in front of door, bubble to clear stacks / swap at each door.
that. is. it.
what did i raid in the past and do i still raid now ? is that your question ? (sry theres words missing from your sentence)
Yes ive cleared Naxx with immortal and undying runs weekly to boost people
Ive cleared Ulduar hard modes, including Yogg 1 light etc, Ive cleared ToC hc (almost had the no wipes one, at 5%
), Ive cleared ICC HC before Cataclysm, Ive cleared BoT hc (hmm possibly not last few bosses here. Am missing sinestra though, guild disband around that point, Ive cleared .
Missing Nefarian too, although i think i did it later for the lols. Not even sure though. Anything before that, yes hc.
Firelands all clear on HC, got legendary. Dragons soul same, all clear on hc.
I am not sure what your point was, i hope i answered the question otherwise this looks like im bragging which is not my itention at all.