I'm sorry but I'd have to disagree that it being "too 1-shotty" is a bad thing.
My opinion is that if a fight has to rely on 1-shots to be difficult, it's not well designed. So yeah, I'd say it's a bad thing, personally.

Other fights don't punish mistakes nearly enough and when a fight does you get people complaining that it should be like every other fight. Vuln stacks don't punish anyone unless you get like 3 or 4. Before that? People generally shrug it off and leave it to healer to top them up.
This is very dependent on the fight. I know in O2S when my group was struggling to begin to consistently win it, the healers were complaining about people who would take even one vuln stack because that often meant the people on the lower side of HP would end up just being 1-shotted by Gravitational Wave (or whatever that regular room-wide attack is called). It already hurts enough without any stacks.