I played for Velious / luclin / PoP mostly, and resist gear was easy to get, but I recall partial resists being a fact of life for druid nukes, but full resists on a nuke were rare. I also remember having to keep 'hand of ro / breath of ro' up on most high geared individuals for nukes to be effective (and the ro line resisted far more easily than a nuke). The ro line seemed to have a really big effect on my spells.
A thing to keep in mind is mana pools. Full resists are a pretty brutal punishment from a mana perspective. It didn't matter back during Luclin/PoP days because mana pools were huge and most classes had other tools but right now eating a full resist would suck.
edit: I should say the people I was fighting at the time were for the most part fully raid geared. Also in Luclin+ most items came with resists.
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