I’m assuming since you were “sweaty” that you ran no more than 2-3 warlocks and your raid was mostly melee. These warlocks should not be getting debuff slots for corruption.
These precious debuff slots would be eaten up quickly by thunderfury + annihilator + nightfall + ignite for fire mages post BWL.
Hunters literally lost their hunter’s mark debuff slot.
Remember ret paladins in vanila?
Like I said, early days. There was no thundefury, no firemages etc.
Early molten core is not “sweaty” but whatever. Guess you didn’t even use annihilator/nf.
We had nf. Everything about classic at the start was sweaty, especially on Firemaw. We weren’t the sweats of the sweats, but we were sweaty enough to council loot based on performance, consumes, played time etc.