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I don't really see the problem. People go in and die all the time to the new abilities a boss has, and that's how they learn. What a battle rez does is let that player get back up and the fight keep going long, potentially letting you see that 2nd new ability on the first pull instead of hitting it and wiping on your second pull.
"This isn’t vanilla WoW anymore. We don’t need 40 people to run raids."
No, and we don't reach bosses with the attitude that if we decurse we get free loot. We don't expect to down each boss, if not on the first attempt, then after only a couple of wipes. Multiple wipes are now acceptable and necessary in the new landscape of raiding.
2 years ago on Is Combat Resurrection Still Needed?