I always view vulnerability stacks as a punishment to the person who incurs them. It isn’t my fault or my responsibility to heal you from a now-one-shot that you could have prevented had you just avoided the bad on the ground. (Obviously, I make exceptions and do my best to save people who are new to fights and don’t know any better—but for those who just blatantly collect them like they’re candy? Nah. But I can also be a very aggressive healer depending on the scenario/situation.)

That said, there have been fights in the past where eating vulns is hardly detrimental to the person who eats it or the healer themselves. O10S had a strat where melee would eat Midgardsormr’s attacks and collect a vuln stack to maintain uptime—and it didn’t really stress out the healers in any way. I feel like vulns are currently more punishing than they have been in the past. Perhaps that’s a product of the stat squish? Or because we’re still in, basically, near-base item level gear for the expansion. I’ll be interested to see if their impact holds up as we progress through the 6.x patches and content.